add ability to inject externa js/css assets
move choropleth to Leaflet.R and add Datamaps class.
add initial version of rcharts app
update rcharts opencpu app
update rcharts app
add ability to view chart in rstudio viewer.
add slide deck to example rcharts app.
update datamaps template
Merge pull request #277 from timelyportfolio/dev

update nvd3 to newest version and use d3.v3.js
Merge branch 'dev' of github.com:ramnathv/rCharts
update nvd3 cdn link in config.yml
fix bug in show method for static mode
add digits = 13 in highcharts for correctly handling dates.
update dimple to v1.1.1
bump version to 0.3.54
preliminary support for disabled groups, needs more work, leave undocumented for now
add htmlspecialchars function from fun package (thanks @yihui)
add iframesrc as mode in show so that entire page can be inlined as an iframe (thanks @kohske)
bump version to 0.3.55
change n1 to .self (thanks @kohske)