Alpha 4 - April 2017

Big features:

• Transition support (reading from EDLs, writing to RV)
• RV session file adapter (writing only) (with help from @tweakjon)
• Maya Sequencer adapter (from @bashesenaxis)
• HLS adapter (from @reinecke)
• Support for saving a collection of OTIO objects in one file (e.g. a bin of timelines & clips)

Smaller stuff:

• API clarification for inclusive/exclusive end_time.
• Conceptual architecture documentation.
• Fixed non-24 fps timecode. (from @reinecke)
• More robust EDL parsing based on production data from real studios. (from @adaro and others)