Breadcrumbs and flash.

* Added breadcrumbs.

* Added flash.

* Small fixes to routes.

* New locale files.
Flash added to comments.
Merge branch 'feature/controllers_refactoring' into develop

* feature/controllers_refactoring:
  Flash added to comments.
  Breadcrumbs and flash.
Nested comments and AJAX started.

* Added ancestry to the comments model.

* Added AJAX creating and destroying for comments.
Nested comments finished!

Also some small fixes here and there.
Merge branch 'feature/nested_comments' into develop

* feature/nested_comments:
  Nested comments finished!
  Nested comments and AJAX started.
Basic uploads functionality.
Pictures with thumbs and secure filenames.

* Added ApplicationUploader.

* Added secure filenames (from snop_snov).

* Added resizing (again, thanks to snop_snov).
Merge branch 'feature/uploader' into develop

* feature/uploader:
  Pictures with thumbs and secure filenames.
  Basic uploads functionality.