.travis.yml needs some work

While investigating some interesting issues on travis, I noticed that these two packages were being installed and were triggering php5-common to install as well. It was knocking out phpenv settings and making builds fail. Travis provides some great documentation on how to actually do this without stomping on phpenv. http://docs.travis-ci.com/user/languages/php/#Apache-%2B-PHP
Merge pull request #17 from unn/patch-2

.travis.yml needs some work