Fixes #1628 by updating Dragonfly API usage.
Added failure scenario for uploading an image of incorrect format

* Also added scenarios for uploading an image of in insert mode (used in wysiwyg editor)

Fixes #2168
Refine JS to not hold a variable.
Update license year
Merge pull request #2183 from jtallant/patch-1

Update license year

[ci skip]
update license year in readme
Avoid redundancy leading to annual commits.
Fix 1.9 hash syntax being present.

Introduced in ed6964f1
Added contribution guidelines. (ht: @bcardarella)
Add Turkish translation (for some of the engines).
Require Rails 3.1.11 or 3.2.12 for security.
Translated images and resources to Turkish
Clean up the YAML a little.
Do not convert user input to symbols
Merge pull request #2191 from Geal/symfix

Do not convert user input to symbols
Refactoring to be truthy
Merge pull request #2195 from gogogarrett/patch-2

Refactoring to be truthy
Remove some duplication from Refinery::Resources
Bump Dragonfly for security

https://groups.google.com/forum/?fromgroups=#!topic/dragonfly-users/3c3WIU3VQTo
Merge pull request #2199 from simi/patch-2

Bump Dragonfly for security