Feature/test summary

Include test summary in build notification. A checkbox is added to build settings page which can be used to specify whether to include test summary or not. If enabled and no tests are found, a "No Tests found" message is appended.

![screenshot from 2014-10-19 21 03 55](https://cloud.githubusercontent.com/assets/1310524/4696484/5b17841e-5811-11e4-8136-ff67f5b3d2cc.png)