Fix typo.
Update Helpshift SDK to 3.3.0
Update README for 3.3.0 release.
Update HelpshiftDemo sample app with descriptions.
Merge branch 'master' of github.com:helpshift/helpshift-android-sdk-examples
Move Helpshift.registerDeviceToken to sendRegistrationIdToBackend.
Merge pull request #3 from helpshift/master

Fix typo.