Version 0.6.0

* Rails 4 Support
* Require fog >= 1.8
* Expose asset delete as 'assets:sync:clean' task
* Altered filtering for keeping files to exclude non-fingerprinted files from being kept
* Use the fog rackspace_region config
* Call #uniq on the list of files to ensure files are not uploaded twice
* Change Rackspace London Auth URL
* Can configure the public_path to store the assets
* Don't delete files that are always uploaded.
* Allow wildcard custom headers
* Added config.log_silently
* Allow invalidation files in cloudfront distribution
* remove rspec deprecated expect { }.not_to raise_error(SpecificErrorClass)
Add jeweler require to rakefile to get tasks back
Regenerate gemspec for version