Changes on AddNewActivityView:
- added check that the name of an new activity cannot be empty (if this is the case and alert is shown, but the dialog doesn't disappear)
- the view has no its own stylesheet: addnewactivity.css
- the dialog has smaller and better fitting width
- the input looks now nicer (table padding, text alignment)
Merge pull request #11 from sandstroh/sandrosbranch

Changes on AddNewActivityView: