* This is good and bad in a couple of different ways
  * bad
    * no UI builder currently works with GtkBuilder
    * need to split into different files because there is no way to define the
      root node
  * good
    * more powerful than glade
    * cleaner API
    * one less dep
* ui/*.ui: new ui files split from the dfeet.glade file which was removed
* tests/uifile_tests.py: script to test the ui files
* dfeet/_ui/uiloader.py(UILoader): new class for loading the .ui files
* dfeet/DFeetApp.py(DFeetApp.__init__): use the new uiloader to load the
  main window
* dfeet/_ui/busbox.py(BusBox.__init__): use the new uiloader to load the
  filter box
* dfeet/_ui/busnameinfobox.py(BusNameInfoBox.__init__): use the new uiloader to
  load the introspect view
* dfeet/_ui/executemethoddialog.py(ExecuteMethodDialog.__init__): use the new ui
  loader to load the main window
* dfeet/_util.py
  (get_glade_file): removed
  (get_ui_dir): added to return where to get the ui files from