Squashed 'subtree/bokehjs/' changes from fa902cc..ab193c8

ab193c8 adding actual grid_plot.coffee demo script
79ee462 Adding grid_plot to demoserver.py index of demos, and fixing up base.coffee to refer to the correct collection for GridPlotContainer

git-subtree-dir: subtree/bokehjs
git-subtree-split: ab193c8fa3635657ec6f882c7550106fa8ec7a95
Merge commit '0b2823eb12ece4570aaa360321985cc800c76932'