Before this commit options for `rails new` and `rails plugin new` had to
be passed in a strict order, trying to execute a following command:

    rails new -J path/to/app

resulted in an error.

This commit fixes the situation and allows to pass path to app anywhere
after `new`

Ability to use a custom builder by passing `--builder` (or `-b`) has
been removed. Consider using application template instead. See this
guide for more detail:
http://guides.rubyonrails.org/rails_application_templates.html

see: https://github.com/blog/1406-namespaced-gists

Introduce ./bin for your app's executables: bin/bundle, bin/rails, bin/rake. Executable scripts are versioned code like the rest of your app. To generate a stub for a bundled gem: 'bundle binstubs unicorn' and 'git add bin/unicorn'

This reverts commit f34c27a4.

We'll be taking a different tack on this with new `bundle binstubs <gem>` support.

This reverts commit 7173c4f9.
This reverts commit a562f9fa.

Users of other SCM's can now generate rails
apps that will add the "empty" directories to source control,
but will not have a useless .gitignore or mis-named .gitkeep
files.

* Change `rails new` and `rails plugin new` generators to name
  the `.gitkeep` as `.keep` in a more SCM-agnostic way.

* Change `--skip-git` option to only skip the `.gitignore` file
  and still generate the `.keep` files.

* Add `--skip-keeps` option to skip the `.keep` files.

It closes #2800.

This reverts commit fa6d921e.

Reason: Not a fan of such massive changes. We usually close such changes
if made to Rails master as a pull request. Following the same principle
here and reverting.

[ci skip]

For future reference, this is the regex I used: ^\s*#\s*\n(?!\s*#). Replace
with the first match, and voilà! Note that the regex matches a little bit too
much, so you probably want to `git add -i .` and go through every single diff
to check if it actually should be changed.

[Carlos Antonio da Silva & Santiago Pastorino]

The purpose of this feature is that the user knows whether
dependencies are satisfied. In particular, if they are not
he will be warned upfront, rather than finding out himself
in an abrupt way by trying to run something.

Signed-off-by: NJosé Valim <jose.valim@gmail.com>