Fixed InApp Message Crash issue

 Fix inApp Messaging Crash  (#44)

* Updated SDK to include BACKGROUND_REFRESH policy for actions

* Updated ReadMe for BACKGROUND_REFRESH

* Add Destroy method

* Included methods to clear cache

* Updated url end point

* Updated regions with correct values

* Refactored

* Updated read

* Updated Readme

* Removed unused files

* Updated send metrics api to send only the metrics array

* included support for boolean and integer for custom attributes

* Refactored

* Fix to ensure that existing custom parameters update the user registration

* Fix to ensure default json for cached parameter is empty

* Updated ui for in app messages

* Updated destroy method

* Add license header

* Add license file

* Update JitPack badge

* Update sample link

* Code cleanup and update API description

* Revert "Merge master"

This reverts commit c9f6cc4aee3b41a495b774ce4fef4d21499b4806, reversing
changes made to 4347ad9dc4e962419732ad6978a932477178929e.

* Update App Credentials

* Change Platform Name

 bluemix-mobile-services/bmd-project-applauch#627

* Fix InApp Message Problem

bluemix-mobile-services/bmd-project-applauch#630

* Remove Location Permission

bluemix-mobile-services/bmd-project-applauch#351

* Fix inApp Messaging Crash

bluemix-mobile-services/bmd-project-applauch#661

* Add google maven dependency

bluemix-mobile-services/bmd-project-applauch#661