0.2:
- changed the colours of the test theme
- improved the rendering of menus, tree views and tabs
- many more improvements

0.3:
- added some CSS options to the engine
- changed the rendering of scrollbars
- improved the test theme
- added a dark test theme

0.4:
- added a spinner
- improved the separators
- updated for GTK+ 3.2
- various smaller improvements

0.4.1:
- added some more options
- various other improvements and bug fixes
