Remove copy:ymls task from build step
Force build.number for the EasyXDM build step

Now payload can be hashed properly,
with same hashes been produced on different build locations.
Update README
Add documentation for Loader
Add documentation for Analytics
Add documentation for Settings
Add documentation for ActionsManager
Add documentation for Session
Add documentation for Biskoto
Add documentation for Promise
Add documentation for Reporter
Add documentation for URLHelper
Add documentation for BrowserHelper