Updated getAllUsers to support calling new users api with offsets and tokens.

    * Modified getAllUsers to support offsets, count & token.
Changed default record count from -1 to 1000.

    * Changed default # of users from -1 to 1000.
Added TODO file.
Added support for updating user.
Added fix for UserManager API mismatch.
Fixed issue with invalid implementation of interface
Refactored order of params for getAllUsers to move searchToken at the end of the API.
Merge branch 'master' into development
Added support for username in principal
Changed PUT to GET for getUsersCount() Api
Merge branch 'development' of github.com:native5/native5-sdk-services-php into development
Merge branch 'development'