Added basic Dropbox integration
Added upload method. Started unifying callbacks
Started adding providers API reference. Further explanation will be written later today
Added Storage providers API reference
Added remove & download methods for Dropbox client
Fixed naming conventions for Dropbox API and removed few errors
Fixed naming conventions + cleanup in other providers
Fixed test error
Better readme
Added test case for MongoDB
Added better case for downloading & removing
URL for Rackspace, Issue #13
URL for Amazon, Issue #13
Disabled Azure & HP due to major works inside pkgcloud
Merge pull request #15 from keystonejs/exit-test-case

Exit test case