Bug 950404 - Missing option to disable home button vibration

Since my hamachi is my only device and the simulator does not offer options to test hardware features (like vibration) I wrote the unit test as an applied carbon copy of the `dialer_ringer_test.js`. I couldn't find resources about the testing functions, so I hope, the test will pass. _6a68 offered to test it.

This is my first patch, please be kind :)

_6a68 and kgrandon were so kind and offered some help while writing it on IRC.