Fixes #1 bourbon border-radius mixin deprecation

Signed-off-by: Tommaso Visconti <tommaso.visconti@gmail.com>
Merge pull request #2 from tommyblue/border-radius-fix

Fixes #1 bourbon border-radius mixin deprecation
Preview size is now an array of dimensions
Fix
ImageMagick shouldn't consider pdf as images
Don't use image? for file type check
Add github pointer for gem in README
Merge pull request #3 from nbrew/github-in-readme

Add github pointer for gem in README
Don't fail if the file is missing
Dragonfly version 0.9.15

To ensure temporary compatibility with Dragonfly. Version 1 has changed
interfaces and this gem needs more work.
Merge pull request #5 from matjack1/master

Dragonfly version 0.9.15
Add rack-cache dependency, needed for Dragonfly
Merge pull request #6 from matjack1/master

Add rack-cache dependency, needed for Dragonfly
Dragonfly::Middleware is already loaded

Dragonfly::Middleware is already loaded in 'dragonfly/rails/images'
Merge pull request #7 from gariggio/master

Dragonfly::Middleware is already loaded