Update documentation 20180529 (#7)
Update documentation 20180529 (#7)

* Updated documentation for ddc-sdk:1.2.0.156@aar , ddc-gcm-scheduler:1.1.0.19

* Misc android documentation updates

* Android documentation: 1)Add android.permission.READ_PHONE_STATE  2)Content Provider configuration

* Android documentation: calling reschedule() multiple times

ebuilderCCO/DDC-SDK-Public,ebuilderCCO/DDC-SDK-Public,ebuilderCCO/DDC-SDK-Public