version bump -> 1.2.0 (Support for Python 2.6, 2.7, 3.2, 3.3, 3.4)

Additionally:
* updated graph_reference to include newer definitions of 'type'
* automatically change depreciated keys (just `'scl'`/`'reversescl'`)
* allow users to do this: `PlotlyList.update(d, make_copies=True)`