Fix a few typos in the MP4 script
Complete parsing of the Microsoft Smooth Streaming Tfrf and Tfxr boxes

This is based on the [MS-SSTR] spec.
Fix the declaration of TrackFragmentRandomAccessEntry (in tfra) in MP4

The size of the box contained all fields, but one of the fields was
misnamed and one was missing.
Merge pull request #11 from mstorsjo/mp4-typo

Fix a few typos in the MP4 script
Merge pull request #12 from mstorsjo/smoothstream-boxes

Complete parsing of the Microsoft Smooth Streaming Tfrf and Tfxr boxes
Merge pull request #13 from mstorsjo/fix-mp4-tfra

Fix the declaration of TrackFragmentRandomAccessEntry (in tfra) in MP4