Add support for Plotly 2.0.0-rcX release candidates. #162
Description
The new Plotly 2.0.0 release candidates introduce a small number of breaking changes, the main issue being their deprecation of the old Plotly.plot(...) method in favour of Plotly.newPlot(...).
Attempting to use angular-plotly with Plotly 2.0.0 results in an error Invalid PlotlyJS object. Please check https://github.com/plotly/angular-plotly.js#quick-start since angular-plotly still uses the old method.
The method signatures appear not to differ between the versions (just the name), so I would suggest selecting either plot or newPlot based on availability to ensure backward compatibility.