Fix #436 where extra line break is added when using windows CRLF (#490)

* Fix InstallGenerator to require annotate
* Fix README

* annotate --routes modifies only routes.rb

This change is a proposed solution to #357 and an alternative to the already proposed solution #361.
In #361 it is needed to call `annotate --routes --ignore-models` to achieve the same as in this change with only `annotate --routes`.

* Call eager_load only when models are included

This to prevent activerecord model errors when using mongoid for example and calling `annotate --routes`

* Drop support of Ruby < 2.2

* add show_complete_foreign_keys as setting

* test for show_complete_foreign_keys setting

LoadError does not descend from `StandardError` so the fallback loading is never invoked.
```
>> LoadError.ancestors
=> [LoadError, ScriptError, Exception, Object, Kernel, BasicObject]
```

Support Database Comment for Rails 5
Added with_comment options

Fix bug introduced by #469.

Fixes #468.

Rename lib/tasks/migrate.rake something more unique to avoid conflicts.

* Prevent root_dir option from being empty

When setting root_dir to an empty string (as is done in the default rake
task config) this line previously caused root_dir to become an empty
array.

This in turn caused factories, specs etc not to be annotated.

This is just a quick band-aid on a larger problem. We have option
parsing spread out over many different places, with slight mismatches
like this in the assumptions made.

* Handle blank values & comma-separated strings in AnnotateModels.root_dir

These cases are currently handled (inconsistently) in the different
option parsing routines.

* Pass root_dir forward unmodified

The different cases are now handled inside AnnotateModels

* Add ruby 2.4 for travis

Do not check if an index includes another column if the name is a String, instead of an Array. (#442)

* Do not check if an index includes another column if the name is a String, instead of an Array.

* Fix Rubocop test conditions.

* --active-admin replaced as a flag.
closes #363.

* Implemented routes in markdown, closes #178

* Fix code style offenses + tests

* Fixed some offenses
* Added test.

Fixed some offenses

* Added new gems.

* Fixed Posgresql index tables with `public`.

Added indexes test.

Added test not crash getting indexes.

* Updated rake and rubocop.