Travis: up ffmpeg version to v2.4.2#203

Merged

cchampet merged 5 commits intoavTranscoder:developfrom

cchampet:travis_upVersionOfDependency

Jan 5, 2016

Commits on Dec 23, 2015

Travis: up ffmpeg version to v2.4.2
Clement Champetier
committed
Travis: added a variant to build with ffmpeg-2.5.7
Clement Champetier
committed
Travis: added comments to explain ENABLE_COVERAGE environment variable
Clement Champetier
committed

Commits on Jan 5, 2016

pyTest: temporary fix when testAddAllStreamsOfAGivenFile
Clement Champetier
committed
INSTALL: updated section of recommended version of dependencies
Clement Champetier
committed