Update paperclip version
Update paperclip and globalize version.
Quickfix of some issues with more recent versions of paperclip.

Drop support of < 3.3.
Use translations metadata to use fallback locale when interpolating url.
Test for translation_metadata before using it.
Change appraisals to use rails 4.0
Add rails4 gemfile and edit travis.yml
Remove unused gemfiles
Fix travis.yml gemfiles
Change status badge.
Test metadata presence on the *_file_name attribute
Remove require pry
Merge commit '8fb1f6b47a' from pauldub/master into rails4
Reverse some changes from pauldub/master merge (README, version)
Travis config: update 2.1.x ruby versions
Remove compatibility code for paperclip 3.3
Travis config: remove unused PAPERCLIP_VERSION
Test different combinations of rails/paperclip versions
Add wwtd for travis-like local testing
Update rspec-rails