[travis-ci] Set language to ruby.
[travis-ci] Move forem dummy_app setup to before_script.
[travis-ci] CI against Ruby 2.0
[travis-ci] Switch priority of build environments.
[travis-ci] Initially allow test failures on 2.0 while it's unpredictable.
Added support for decorators and moved faux 'extensions' to decorators instead.
Merge pull request #367 from radar/decorators

Added support for decorators and moved faux 'extensions' to decorators instead
Updated build status icon.
Change Engine.root to match the actual root of Forem and not the lib directory.

Fixes #366
Require any 4.x version but at least version 4.0.9 of friendly_id.

Fixes #366
Update to newest decorators to allow more Rails versions.

Fixes #369
Updated RefineryCMS to Refinery CMS
Fix indentation on 'Either way...' line in install generator
Made installer more obvious
remove hard dependency on forem-redcarpet
ignore .ruby-version files
update development dependencies:

* upgrade rspec to 2.12
* upgrade capybara to 2.0
* specify versions for dependencies that were 
  missing them
update Gemfile to support JRuby for testing:

* specify platform specific dependencies
* remove Gemfile.lock and ignore it due to 
  platform-specific dependencies
update rspec support:

* refactor spec helper to take better advantage of
  the support/ directory
* updates to support newer capybara
move factories out of support/ to match convention