Change plurality of assert for python3.5.

simple otio viewer (AcademySoftwareFoundation#52)

* simple otio viewer

* - maintains namespaces when importing
- uses .format in favor of % for string formatting
- queries adapter manifest for available file extensions

* Moves otio view widget into its own library

* make otioview executable

Addressed python3 support. resolves AcademySoftwareFoundation#19 (Aca…

…demySoftwareFoundation#32)

* Addressed python3 support. resolves AcademySoftwareFoundation#19

* Added unitests for comparison of TimeRange and TimeTransform and fixed inequality checks

* Added python3.5 to README and converted from io import StringIO to import io

Initial alpha release for evaluation by invite-only community.