Added headers to the Digest.
Added resource manager
Fetching and lazy loading of resources working
Added all resources
Unit tests through directory creating accounts
Added documentation and unit tests:
Updated readme
Added travis config
Added caching of resources
Cleared old register
Cache refresh on update
Fix cache test
More correct instructions for composer
Secured packagist name
Updated dependencies
Updated Doctrine version
Collection sorting and searching
Added resource expansion
Added expand to find()
Use keep alive