Add #version_exists?
Refactor active_versions
Only return version url if version exists
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
Fix recently added move_to_cache specs that were using the old cache ID format
Merge pull request #1108 from carrierwaveuploader/cache_id

Use integer time to generate cache IDs, applies to #1102