Adds image pipeline for resizing.
Adds flag indicating use of sub directories for assets.
Merge branch 'master' into feature/assetpipeline

* master:
  Fixes link to contributing.md from readme.me
  Adds contributing.md and updates readme.me for coffeescript pipe.
Fixes caching for image pipe by introducing flex-options as get-paramters.
Merge branch 'feature/assetpipeline'

* feature/assetpipeline:
  Fixes caching for image pipe by introducing flex-options as get-paramters.
  Adds flag indicating use of sub directories for assets.
  Adds image pipeline for resizing.
Changes resizing option to be optional.
Merge branch 'feature/assetpipeline'

* feature/assetpipeline:
  Changes resizing option to be optional.