Added UserData class to store and handle user data
Added UserData tests
Added method to set User data in Countly.java by providing bundle
Added userdetails to query string in ConnectionQueue
Added uploading picture from provided path in ConnectionProcessort
Updated Readme with information about setting usr data
Changed userdetails to user_details and null on empty
Merge branch 'master' of https://github.com/ar2rsawseen/countly-sdk-android
Updated README on deleting user properties
Merge pull request #43 from ar2rsawseen/master

Added support for providing user data
Update README with init being called from Application.onCreate
Merge remote-tracking branch 'origin/master' into messaging

Conflicts:
	README.md
Fixing tests for UserData-related functionality
Adding Advertising ID support
Advertising ID support
Merge branch 'messaging' of github.com:Countly/countly-sdk-android into messaging

Conflicts:
	README.md