Resolves https://github.com/amberframework/amber/issues/730

When form submission with repeated form input names it returns the last
value of the list.

Example:

```html
<input name="cat" value="1" type="checkbox" checked>
<input name="cat" value="0" type="checkbox">
```

Actual

```crystal
params.raw_params['cat'] == 1
params.raw_params.to_h['cat'] == 0
params['cat'] == 1
```

Expected

```crystal
Params.raw_params['cat'] == 1
Params.raw_params.to_h['cat'] == 1
params['cat'] == 1
```

Removes the used of `.merge()` method in favor of manually merging the
hash.

This slows down the hash generation of the params

Docker recommends using COPY if you don't need URL or TAR extraction.

https://docs.docker.com/develop/develop-images/dockerfile_best-practices

* [CORS] Fixes Cors Headers Match Case Insensitive

Resolves https://github.com/amberframework/amber/issues/757

This solves two issues with CORS:

Headers currently are not checking case-insensitive values for
`Access-Control-Request-Headers`. Allowed headers should match
against `Access-Control-Request-Headers` values.

There was the belief that `response.flush` writes the contents of the
response halting the request, this is not true, instead the request is
continuing the pipeline.

- Adds case insensitive check to `Access-Control-Request-Headers`
- Validates that `Access-Control-Request-Headers` values match against
ALLOWED_HEADERS
- Adds invalid preflight specs.
- Prevents call next for preflight requests

With these changes in the event of preflight requests should
respond to case insensitive preflight headers and the `call_next`
should not be called.

* fixup! [CORS] Fixes Cors Headers Match Case Insensitive

Resolves https://github.com/amberframework/amber/issues/753

Allows to shows Granite logger output when running `db seed` command
this gives feedback to the user of which actions has been performed against
the database without using puts.

This does not fix the case when using `puts` inside the `db/seeds.cr` file, instead
`Amber.logger.info` can be used in its place

Example

```crystal
require "../config/application.cr"

user = User.new

user.email = "admin@example.com"
user.password = "password"
user.save

Amber.logger.info user.to_h
```
Gives the following output
```bash
 ± bin/amber db seed
07:15:27 Granite    | (INFO) SELECT users.id, users.firstname, users.lastname, users.email, users.hashed_password, users.created_at, users.updated_at FROM users WHERE email=$1 LIMIT 1: admin@example.com
07:15:27 Granite    | (INFO) INSERT INTO users (firstname, lastname, email, hashed_password, created_at, updated_at) VALUES ($1, $2, $3, $4, $5, $6): [nil, nil, "admin@example.com", "$2a$10$qnUcrAHYW2dJ6HgRsGU9x.PtNAv6KLJGq9.HZQ69WkBwsGlRQ6R4e", "2018-04-14 23:15:27", "2018-04-14 23:15:27"]
07:15:27 Server     | (INFO) {"id" => 1_i64, "firstname" => nil, "lastname" => nil, "email" => "admin@example.com", "hashed_password" => "$2a$10$qnUcrAHYW2dJ6HgRsGU9x.PtNAv6KLJGq9.HZQ69WkBwsGlRQ6R4e", "created_at" => "2018-04-14 23:15:27", "updated_at" => "2018-04-14 23:15:27"}
07:15:27 Database   | (INFO) Seeded database
```

* Improve column names in `amber pipelines`
* Fix spec

* [CI] Attempts to fix Build Spec For Consistency

- Removes the Prepare DB YAML, this was use for when CI used to run on a
docker image which is no longer the case
- Renames the Postgres Travis CI service to Postgresql
- Run regrssion tests only if is master

* fixup! [CI] Attempts to fix Build Spec For Consistency

Recipes and some other source files had extra lines and bad formatting
this corrects the format by apply the `crystal tool format` to the
source code.

This formats the source code and keeps things neat.

* remove the filters which have been merged into liquid.cr shard

    - specify a minimum version of TechMagister/liquid.cr
    - remove the liquid filters file

    This change removes the recipe filters (which were temporary) as they
    have been merged into the TechMagister/liquid.cr master branch
    and are thus no longer required here.

* Add links in Contributing section

* Add codetriage badge

* Fix codetriage badge

* Add missing period

* Use Contributors  instead of Helpers

* Moves Philosophy to his own section

* Move community section to the top

Depends on: https://github.com/TechMagister/liquid.cr/issues/29

- Cleans the shard.yml improving readability
- Adds missing version number for the liquid shard

* Add stack-overflow advice
* Review edits

* [CLI] add support for recipes

* add a recipe option to amber new|generate to create applications and
  scaffolding from recipes

Issue: https://github.com/amberframework/amber/issues/629

- adds TechMagister/liquid template language to shards
- adds a recipes folder to amber/cli
- adds recipe option to cli and saves the recipe name|path in .amber.yml
- adds support for recipes to amber/cli/commands/[new|generate].cr
- adds to_json method to amber/cli/templates/field.cr

This adds the ability to generate applications and scaffolding from a recipe
given as a recipe name or a file system path.  Recipes given as a recipe name
are downloaded from amberframework/recipes repository.

* [CLI] enhancements to add support for recipes
* improvements to enhance the recipes feature

- recipe cache in $HOME/.amber/recipe_cache
- app generator views filter only blocks .ecr or .slang
- fix a typo, class_name is a method
- add uppercase filter

This places the recipe cache in the user's home folder so there will be a
single instance of the cache rather than multiple instances. The app generator
is changed so that it only filters out views for the template language that
is not being generated to allow any other type of file in views e.g.
javascript. Some generators where using @class_name instead of class_name,
this typo is fixed.  A filter has been added to uppercase a string using
upcase or uppercase.

update granite version to v0.9.1

Update to 0.7.2

* Add missing attribute
* Recompile main.bundle.js
* Regenerate amber.min.js

Fixes regression in 0.7.1 caused by a fix for a regression in 0.7.0

* Bumped version number to v0.7.1.

* Setting amber version lock back to master after release of v0.7.1

* fixed delete link in a method similar to rails, django and other frameworks

added customizable message data-confirm

* Use plain JavaScript

Compatible with almost all browsers (even IE)

* Bumped version number to v0.7.0.

* Setting amber version lock back to master after release of v0.7.0

* Add a CLI option `amber db` to open connection to database

This is an easy way to open a connection to your database.
This is modeled off the Rails CLI.

* Duplicate database connection command to `amber bd connect`

- Adds missing specs

* [Router] Adds OPTIONS and HEAD routes by default

Issue https://github.com/amberframework/amber/issues/240
HTTP Specs for Methos https://www.w3.org/Protocols/rfc2616/rfc2616-sec9.html

OPTIONS and HEAD routes should be automatically defined for routes
currently developers have to define the OPTIONS route via the option
route method.

- Removes the add_head method from router
- Adds OPTIONS and HEAD routes ass needed via DSL

With these changes developers should no longer need to specify the
OPTIONS and HEAD routes and will now be defined by default.

* Align route line

* Add StackOverflow tag: amber-framework

* Try to fit on just one line

* Remove period

* Change README header to Markdown only

* Use an horizontal aligned logo

Close `a` tag instead of erroneous `div` in `auth/+_nav.ecr.ecr`