Simplify image validating for MiniMagick
Delete temp file after manipulate
More readable generation of exception message
Remove duplicate timecop dependency
Merge pull request #1322 from dimko/patch-3

Duplicate timecop dependency
Merge pull request #1321 from dimko/patch-2

Temp directory overflow issue
Ensure #remove_#{column} and #remove_#{column} return false after committing with ActiveRecord, closes #1318
Make cache storage pluggable