Merge pull request #2 from helpshift/master

Readme updates
Update Helpshift SDK to 3.3.0
Fix typo.
Update README for 3.3.0 release.
Move Helpshift.registerDeviceToken to sendRegistrationIdToBackend.
Update HelpshiftDemo sample app with descriptions.
Merge pull request #3 from helpshift/master

Fix typo.
Add demo project for Gradle.