fumieval/free-game — pull request #23 by cosmo0920 (2014-02-09 02:06:23+00:00)
Title: add install section in .travis.yml.

add before_install: into travis.yml to install dependent C library.
missing C library causes following error:

```log
setup-Cabal-1.16.0-x86_64-linux-ghc-7.6.3: Missing dependency on a foreign
library:
* Missing C library: Xxf86vm
```