assign graph to variable so that handlers can use it.
allow layer to copy aesthetics from the primary layer.
fix colors in Rickshaw and add preliminary support for yAxis.
add merge_list to utils.R
edit Rickshaw layouts and add examples.R
minor fix to facet example for polycharts
update xcharts examples and layout
update examples for morrisjs and rickshaw
use group names as default labels
modify gitignore
add utilities to publish as gist.
add a publish function to rCharts Class
add gist.R to collate and bump version.
build and roxygen
resolve merge conflict

Merge remote-tracking branch 'ramnathv/master'

Conflicts:
	DESCRIPTION