cmx3600 reverse and dissolve fixes

[reinecke]

• Addressed an issue where the speed change regex wouldn't properly parse reversed clips
• Fixed assumption that clips used in a transition would always be continuous with the clips before and after the transition

Additional notes:
This fix works but is a touch messy. The parser is structured in a way that OTIO Clips are created before all the metadata that might apply to them has been parsed and some of the transition handling is a bit band-aidy as a result. We may start thinking about how to refactor a bit to make the code a bit cleaner for these situations.

[ssteinbach]

Question about the comment and really small note about one of the functions. Thanks!

[reinecke]

Good notes! Updated with clarifications.

[codecov-commenter]

Codecov Report

Merging #687 into master will increase coverage by 0.15%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #687      +/-   ##
==========================================
+ Coverage   81.72%   81.88%   +0.15%     
==========================================
  Files          72       72              
  Lines        2731     2755      +24     
==========================================
+ Hits         2232     2256      +24     
  Misses        499      499              

Flag	Coverage Δ
#py27	81.86% <ø> (+0.15%)	⬆️
#py36	81.86% <ø> (+0.15%)	⬆️
#py37	81.86% <ø> (+0.15%)	⬆️

Impacted Files	Coverage Δ
src/opentime/timeRange.h	100.00% <0.00%> (ø)
...imelineio/opentime-bindings/opentime_timeRange.cpp	100.00% <0.00%> (ø)

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