Merge branch 'release/0.1.4' into develop
Relase the GIL on MediaInfo.open().
Cannot call back to Ruby without re-acquiring the GIL.
Merge branch 'feature/release-the-gvl-on-open' into develop
Bump to 0.1.5.
Merge branch 'release/0.1.5'
Merge remote-tracking branch 'origin/master'