test (and if needed fix) compatibility with plotly

[raysinensis]

for interactive integration with shiny

[raysinensis]

currently, it's easy to coerce GeomPointTrace/GeomLineTrace to simple dot/line plot in ggplotly()

geom2trace.GeomPointTrace <- getFromNamespace("geom2trace.GeomPoint", asNamespace("plotly"))
to_basic.GeomLineTrace <- getFromNamespace("to_basic.GeomLine", asNamespace("plotly"))

Actual features of the package though, will take more digging

[raysinensis]

Extremely hacky way to get here:

Several issues, mainly ggplotly() converts 1 ggplot object layer to 1 set of scatter to draw

[raysinensis]

by group plotting would be possible if we change data to 1 layer

[sheridar]

This is a good idea and should be feasible, but I think we should resolve #39 before any further restructuring of the functions

[raysinensis]

agreed