possible way to expose plot object to js integration code
checkpoint some spectrogram refactor code (non-functional)

checkpoint
Merge branch 'master' into feature/spectrogram
empty plots rendering, but layout is off
Merge branch 'master' into feature/spectrogram
restore html template
Merge branch 'master' into feature/spectrogram
first stab at simple linear color mapper in python
hook up colormapper to image glyph
handle all non-spec params correctly
update examples
update tests
Support JSON serialization for palette; improved error remproting
Modifed image downsample for python-side linearcolormapper
Merge branch 'master' into feature/spectrogram
add width: auto to vbox to prevent infinite widths
pass on toolbar location in plotting.py
misc improvements
Catching up to 0.6.0 (ish) master
Fixing imports