Add a Cleaner for Tracker Needle Desktop Search

Only one option, which will remove a file containing search history, saving around 4 KiB.

Tested on Fedora 19 with Tracker Needle 0.16.1 and BleachBit 0.9.5.

Tracker Needle is a part of Tracker semantic data storage. Project homepage: http://projects.gnome.org/tracker/