v2.47.rc4

• FEC-5861 - regression: pages don't load on FF and IE
• FEC-5863 - Shaka failed after preroll - Chrome 52
• After Replay big play button is not removed and scrubber does not progress
• Added FairPlay offline support to the GetLicenseData service
• Add validation for checking if HTTP_USER_AGENT is not empty
• Resolve the source URL before letting Shaka to load it