import yaml in namespace
minor fixes to make parent class compatible with rNVD3
allow stylesheet in setupResources and modify showOutput.
replace rCharts with new implementation
add imports
move RCHART_LIB initialization to PolyCharts.
load plyr to fix bug in example run
allow specification of lib in showOutput
reorganize code based on classes
move apps into apps folder
add nvd3 to inst
add NVD3 class
move plotting functions with class for PolyCharts
add NVD3 class to output (to fix later)
add collate to DESCRIPTION
modify path to oecd app in gitignore
add r2json utility functions
add test examples for nvd3 plots
minor reformatting
minor tweaks to doc and add author