Update README.md

Included 
require(rCharts) 
in the "install" section of the example.

Similar to http://ramnathv.github.io/rCharts/
add toGeoJSON as utility function.
minor correction in README.
update version.
remove runExample as it conflicts with shiny.
clarify licenses more clearly.
add functions for making examples.
cosmetic changes.
modify create_chart and move to makeExamples.R