Implementation #43 full commit description in commit view

Requires some changes on the git server as well https://github.com/devhub-tud/git-server/pull/29
Builds upon PR #53 in order to make the Selenium tests work in the new FF.

![screen shot 2014-11-01 at 03 37 24](https://cloud.githubusercontent.com/assets/3469492/4870521/13810496-6170-11e4-8f01-da89a1cbcc3a.png)