fix https://github.com/ContinuumIO/bokeh/issues/466
Added new IPython versions and raise exception if IPython versions do not match.
mpl kwarg and example fixes
fixup for anscombe and population_server
Merge pull request #685 from ContinuumIO/fix/height_width_attr_name

fix plot_width and plot_height attr names
continuum.less refactoring
pivot.less refactoring
overrides.less reformatting
flexbox reformatting
main and widgets less refactoring
Merge branch 'master' into feature/abstract_rendering
more succinct server config message
fix stupid typo
allow ranges to be specified as sequences
formatting
merge master
Merge pull request #686 from damianavila/fix_magic

Added new IPython versions and raise exception if IPython versions do not match.
Merge pull request #688 from sahat/master

LESS refactoring
Merge pull request #691 from ContinuumIO/range_simpler

allow ranges to be specified as sequences
Merge pull request #689 from ContinuumIO/verbose_config

more succinct server config message