add more examples for Highcharts
hPlot: size -> radius
add open_notebook to utils.R and some minor documentation changes.
add notebook app to apps
import RJSONIO instead of rjson
initial support for Vega.
update location of notebook app
add minimum height so that xcharts svg doesn't get compressed while printing in a notebook.
correct option to options.
add .cache to .gitignore
bump version.
add names argument to toJSONArray2
update hPlot and remove data method
Merge remote-tracking branch 'ramnathv/master' into hPlot
add examples
synchronize notebook with screencast.
update toJSONArray2

replace apply with lapply to avoid converting numeric values to
character
add hPlot pie chart example
Merge remote-tracking branch 'ramnathv/master' into hPlot
change hPlot argument color -> group