For issue 77. Changed some code in multiBar.js to use selection.transition() instead of d3.transition(selection) syntax.
Rebuilt nv.d3.js and nv.d3.min.js, for issue #77 fix.
Merge branch 'master' of https://github.com/novus/nvd3 into development

Conflicts:
	nv.d3.js
	nv.d3.min.js
	src/models/multiBar.js