Initial commit
Merge https://github.com/Ace17/zenbuild
Add README.md
markdown modifications
Fix invocation without arguments. Show usage
Merge remote-tracking branch 'seba/master'

Conflicts:
	README.md
add x265 as used for the gpac extra_libs builds
README about PATH restrictions
add libass for FFmpeg
align README.md with script
Merge pull request #1 from rbouqueau/master

small additions