Add a module for supporting multiple files
Pluralize column name
First stab at supporting arrays
Make mounter work with single mount
Fix ActiveRecord integration
Fix removal of previous files
Fix identifiers
Make remaining specs pass
Move back into mount file
Move mount spec
Remove duplication
Fix documentation for mount_uploaders
Switch to PostgreSQL in tests
Fix activerecord integration
Add README section about multiple file uploads
Remove duplication in ActiveRecord integration
Fix fallback on _url method
Merge remote-tracking branch 'origin/mount-multiple'

Conflicts:
	lib/carrierwave/mount.rb
	lib/carrierwave/orm/activerecord.rb
Switch back to after_safe for removing previous columns, mark specs as pending