[CDF-277] - CCC - in an area chart, a mousemove extension point with hoverable and tooltip enabled throws an error
* Updated protovis, to fix the pv.Area#getEventHandler method which was not taking into account that handlers may be functions or arrays of functions.
Merge pull request #86 from dcleao/CDF-277

[CDF-277] - CCC - in an area chart, a mousemove extension point with hoverable and tooltip enabled throws an error