Merge pull request #7 from fbuenemann/feature/self_and_ancestors

Add support for self_and_ancestors
Converted roots to scopes.

Thanks to Felix Buenemann (http://github.com/fbuenemann) for this great change.
1.2.0 release prep
Remove gemnasium from README
Fixing small typo in README.
Merge pull request #9 from seanhussey/patch-1

Fixing small typo in README.
Fix Rails 4 deprecation warning
Changed so that it works for both Rails 3 and Rails 4
Fixed Rails 4 deprecation warnings
Don't rely on Rails for version information
In Rails 4 you have to pass a lambda to the :order option
Added syntax highlighting
Revert to original solution
Merge pull request #11 from mischa78/master

Fix Rails 4 deprecation warnings (this time with passing tests)