Added subplots support to BokehRenderer.
Integrated pyplot.py into mpl.py. Also reordered the imports and made some comments.
Deprecating show_bokeh, still functional until the final removal in 0.6.
Fixed examples to make it work with mpl.to_bokeh()
Merged master in and fixed conflicts.
Merged master in and fixed mpl conflict because a no longer use gallery PLOTLIST.
Merge pull request #606 from damianavila/mpl_subplots

mplsubplots fix and integration of show_bokeh into mpl.py