Squashed 'subtree/bokehjs/' changes from c3bfcc3..9e1ba42

9e1ba42 remove embed tool button from plots

git-subtree-dir: subtree/bokehjs
git-subtree-split: 9e1ba421006816152e1db7420223d70a50fd9e12
Squashed 'subtree/bokehjs/' changes from 9e1ba42..9467c8b

9467c8b  added back original bootstrap css for use only with the welcome and demo pages

git-subtree-dir: subtree/bokehjs
git-subtree-split: 9467c8b376ea05b95d75e16f31efb7021f46b06a