Add support for x86_64 cross compiling in Travis CI
Merge branch 'features/add-x86_64-travis-ci-support' of https://github.com/xhairball/ioq3
Merge READMEs, add Travis build status and remove tracking from ioq3
Update Travis CI for now so it doesn't try to cross compile this branch

The other branches should cross compile fine.  Revert this change once
ioquake3 adds vorbis or else when OpenArena merges it from a branch.
Add space