let gridplots with hover tools function at all
turn bar plots category (values) width proportional to the number of values on each category
basic fixes for crossfilter rendering
Add comment about cat width calculation
Merge pull request #1360 from bokeh/fpliger/1319_charts_overlapping_bars

turn bar plots category (values) width proportional to the number of val...
removing width/height which are undefined anyways because @dpi_ratio is not set
changing crossfilter plot container class from bk-plot to bk-crossfilter-plot
Merge remote-tracking branch 'origin/master' into fix_crossfilter
border_symmetry no longer used
removing gevent
Remove dysfunctional ObjectExplorer tool and widget
Remove jstree since it's not needed anymore
More systematic approach to tool validation

This employs similar technique to what HasProps.__setattr__() uses.
Merge pull request #1371 from bokeh/mattpap/remove_object_explorer

Remove ObjectExplorer
Merge remote-tracking branch 'origin/master' into mattpap/tools_help

Conflicts:
	bokeh/plotting_helpers.py
Simplify _plot_from_string() by setting 'plot' afterwards
Sort tools and attributes to get consistent help results
Fix computation of repeated tools and do it only once
Rename p to plot in _new_xy_plot()
custom logging