Add inital searchbar integration
Fix position of searchbar to appear on the top
Add searchbar.py in Makefile.am
Make searchbutton togglable
Make some views filterable
Open search bar on Ctrl-F
Don't set visible function if it is already set
Make pep8 happy and remove remaining stuff
Close search toolbar on switching views
Correct path correctly while selecting tracks on Songs view
Make Songs view filterable
Don't crash on playing track
Use ListStore instead of TreeStore