Feature/comment commenter gadget

see #29 for reference, so far we would like to test

* [ ] `// @todo`
* [ ] `// dont commit` or something similar

both features can be enabled/disabled in the config
This method's logic is a bit hard to grasp or maybe I just think the other way around. My approach would have been

* go through all comments
* split all comments in lines
* check for every line which blacklists match
* user stristr instead of explode

Maybe discuss this at the "dojo" tonight?