TravisCI

Well, just use TravisCI to run the existing unit test :)
It is working on my branch, [see here](https://travis-ci.org/andyli/haxelib/builds/13595941).

Before merging this pull request, please activate TravisCI first:

1. Head to https://travis-ci.org/profile
2. Select HaxeFoundation from the left hand side
3. Switch this repo on.