Fix search and add fuzzy search option

[jesperbakhandskemager]

Fixes #242

[jesperbakhandskemager]

I want to note that self.applicationsBox.get_children()[0].grab_focus() on line 591 puts the first application in the list into focus before putting the focus on the search bar.

This is done to prevent the applicationbox being scrolled down to the last searched item if the Menu shows Favorites when the menu is opened and nothing is done before clicking "All Applications".

As item["button"].connect("focus-in-event", self.scrollItemIntoView) (line 1692) will otherwise activate scrollItemIntoView and scroll down to the last application that was in focus