trying to make the stocks example include the embed_tool
Squashed 'subtree/bokehjs/' changes from ea3e56c..e62ef24

e62ef24  removed unused js_template.  It was confusing
a2324b2  embed tool is now apearing by default
cbe96a9  removed unused requires
5c27598  fixed some syntax errors
b9a14c1  made the ButtonEventGenerator work again
74aeb34 fixed reference to EmbedTool
1a293d7  fixed the heights of grid_plots

git-subtree-dir: subtree/bokehjs
git-subtree-split: e62ef24f6a9aa2913a805887c8cbcbec6048c5e7
 plotting.py now supports making the embedtool showup