porting Menu to ElementTree & refactor parsing methods
ported MenuEditor to ElementTree, needs unit tests !!!
modules work better when imported...
fixed MenuEditor.__saveMenu()
sort is now a method of xdg.Menu.Menu
removed instance variable in xdg.Menu.Parser
Minor fixes to xdg.Menu
Merge pull request #1 from takluyver/etree

Minor fixes to xdg.Menu
Merge pull request #4 from ju1ius/etree

Port of Menu & Menu editor to ElementTree