Adds Device model for device/user mapping
Adds device id property from headers and fixes register uri check
Updates Device model and fixes flow for User.create / User.verify
Removes duplicated 401 session check and adds http_session property
Adds ObjectWrap.update, ObjectWrap.response, Object.create members
Merge pull request #34 from techiev2/users

Adds Device model for device/user mapping and registration flow changes