card_set.py abilities error

Using the commit c3f2827 from master and also the rna branch causes this error:

`  File "d:\installed\Python27\lib\site-packages\mtga-0.5.2-py2.7.egg\mtga\models\card_set.py", line 34
    self.lookup = {**abilities}
                    ^
SyntaxError: invalid syntax`
