Since we I use The silver searcher now I can remove ACK.

This also removes MiniBufExpl complete. VIM-Airline shows all buffers
very nicely.
Add the plugin VIM-Unimpaired and change the mappings.

* Line swapping is now powered by VIM-Unimpaired.
* I also can now swap multiple lines.
* Arrow keys are disabled now in visual mode
Add a :QuickFixDo command

Now its possible to search and replace over all the files in the
QuickFix window.