Add #version_exists?
Refactor active_versions
Only return version url if version exists
Don't suppress original errors if translation of error messages is unavailable.
Fall back to english locale instead of passing I18n rtanslation error.
update tests to match changes in MiniMagick v3.6.0 committed in 26e955d9854f9acbf7eb809dce968156de09780a
carry file type change across multiple manipulations ; add additional tests of transparency
Merge pull request #1099 from woodwardjd/maintain_file_conversion_across_processing

Maintain file type conversion across processing
Add sprockets rails helper info for Rails 4
Fix homepage in gemspec
Merge pull request #1106 from steveklabnik/patch-1

Fix homepage in gemspec
Drop multi_json in favor of vanilla json, closes #1105
Use integer time to generate cache IDs, applies to #1102
Merge pull request #1092 from tmaier/master

Add method #version_exists?
Fix cuke steps
Don't enforce the move_to_cache config option on versions, closes #1088
fix busted tests on ruby 1.8.7 (1.9.3 also re-checked)
Merge pull request #1109 from woodwardjd/maintain_file_conversion_across_processing

fix busted tests on ruby 1.8.7 (1.9.3 also re-checked)
Update URLs to carrierwaveuploader/carrierwave
Merge branch 'master' into cache_id