Squashed 'subtree/bokehjs/' changes from cd96f66..1b484bc

1b484bc merge subtree
c0a2fb6 attempt to make lines sharper by rounding pixel coordinates

git-subtree-dir: subtree/bokehjs
git-subtree-split: 1b484bc882efbdc009b201e54db7a66022b89cbb
Merge commit 'e96a8f3f08636d1c23bcc4b7d282013bc1feb419'