simple hack to get elastic to work with binned groups

i don't claim this is correct or general, just want to keep the conversation
moving

Conflicts:
	dc.min.js
Rename local variables in `group.stack` method
Added support for hiding and showing individual graph stacks
Added documentation for chart stack hiding/showing for grunt docs
Merge pull request #325 from sclevine/master

Added support for hiding and showing individual graph stacks
Added option to calculate height and/or width on render.
By default, uses height and width of anchor DOM element.
Can optionally specify function to use for calculation.
Allow for dynamic chart sizing. Closes #295
do not draw undefined points for lineChart. Closes #330
Merge remote-tracking branch 'origin/auto-size'

Conflicts:
	dc.min.js
	dc.min.js.map
always assign scale to axis in row chart. Fix #328
upgrade d3 for webpage
Refactor colors. Fixes #318
Merge branch 'color-refactor'
join bubble chart data on keyAccessor
Merge remote-tracking branch 'origin/pr/279'

Conflicts:
	dc.min.js
add colorbrewer for examples
add missing color test from the color refactor
add createSeries to the composite chart
add series chart
fix legends so that they work with color scale based color charts