exercise embed.py module
Merge branch 'master' into feature/tests
add tests for resources.py
Add js test for ColumnDataSource

Also took this opportunity to remove unused methods, regularize
method names on ColumnDataSource, and handle some edge cases properly
Merge branch 'master' into feature/tests
Basic ar image rgb working
Interpolate colors for image_rgb (draft 2; works)
temp fix for missing bs4 dep
try again for bs4
different bs4 name is on default channels
Replot function working.
Fixed box-zoom on AR; AR skips ajax requests with now screen bounds
Merge branch 'master' into feature/tests

Conflicts:
	scripts/travis_install
First render returns empty image and data bounds
Cleanup example
adding under-defined state guard to image and line downsample (line downsample still not working properly)
DRAFT insertion of isocontours

also renamed 'Transfer' to 'Shader'
WIP: Contours; multi_line erroneously assumes datatime for ranges...
Swapped order of types so NaN deserializes None instead of Today
WIP: Contours -- Does not error...does not plot anything.