Update .travis.yml
Add basic IO for Pinhole and BrownPinhole camera model. #182
If empty, return directly.
rename _map_matches_F in _map_matches_E
Add a L2 translation averaging method (implementation based on 'Robust Global Translations with 1DSfM'). #183
Merge branch 'master' of https://github.com/openMVG/openMVG

Conflicts:
	.travis.yml
Merge branch 'develop' of https://github.com/openMVG/openMVG