support for elements as anchors

jQuery is okay with an element object being used as a selector
this patch allows dc.js to work with elements as well as '#id' selectors
artifacts
remove groupOrdering & fix wedge ordering
a work branch
hack for fixing elastic binned bars
Merge branch 'fix-bar-elastic' into work
artifacts
update version number
start v1.6 dev
remove global functions
remove old pie chart labels upon update
fix overzealous jshint cleanup
rebuild with #254
set tests failing for #248 to pending so build will succeed
build for node versions .8, .10, .11 with travis-ci
fix bug null/undefined bug
Merge pull request #263 from NickQiZhu/fix-node-8

fix bug null/undefined bug
set version to 1.6.0-dev
only build on 0.10 on travisci - for now
fix overzealous jshint cleanup

Conflicts:
	dc.js
	dc.min.js
	src/pie-chart.js