highcharts: add setListSpec

specific for series, xAxis and yAxis
highcharts: put error if invalid data
update error message
highcharts: fix to issue #138

replaces error message with a fix
highcharts: add exporting feature
Merge remote-tracking branch 'ramnathv/dev' into axis-list-fix

# By Ramnath Vaidyanathan (23) and others
# Via Ramnath Vaidyanathan
* ramnathv/dev: (35 commits)
  add TimelineJS to rCharts
  center data tables
  add dTable thanks to @ramnathv suggestion
  change template to allow width specification
  minor change to datatables examples.r
  complete very alpha version of datatables
  remove unnecessary files from dimple directory
  add datgui template to nvd3 controls
  add renderChart2, a modified version of renderChart. will replace renderChart eventually.
  update polychart library
  add color axis functionality that dimple offers
  add rChart as class to chartDiv while using Shiny.
  update to newest version of dimple fixing bug in timeaxis
  reflow comments for better appearance.
  modify renderChart so that height and width settings of container div get included.
  remove setTemplate since unnecessary in production
  new version of dimple.v1.js and add timeAxis example/test
  fix buggy setBounds for dimple and add timeAxis for dimple
  add angularJS controls to polychart.
  move addControls to rCharts class.
  ...
Merge pull request #173 from reinholdsson/axis-list-fix

highcharts: axis list fix
Merge pull request #172 from reinholdsson/highcharts-exporting-feature

highcharts: add exporting feature
deal with libraries on http differently.
refactor setLib, and overload show method to save html and output iframe tags.