Merge lp://staging/~gaspa/a4/neweditor into lp://staging/a4

This branch addresses mainly some additional features to add to our editor.

Visually I added a toolbar with the common tools we'd like to use. Its status is:
 * the only completely working button is 'path', as it does the same thing as usual.
 * text and rect button works, but they don't handle correctly the position of the region.
 * the other buttons still don't work.

I added a FeaturedPresentation object (better names are welcome), that handle adding tag to svg.

Some littler changes:
* replaced show_all with show() in app.py
* cleaned some commented things that hasn't been used since now.
* these two lines:
 + #self.builder.get_object('menubar1').set_visible(not self.is_fullscreen)
 + #self.builder.get_object('main_toolbar').set_visible(not self.is_fullscreen)
  will handle the fullscreen correctly, they are commented as there's no way to return from fullscreen currently.