highcharter v0.2.0

• Implemenation of highcharts with boost module highchart2() (#43).
  This include highcharts.js, exporting.js and boost-module.js.
• Highstock implementation/support (#10)
• Highmaps implementation/support (#25)
• Adding themes (#35): 538, economis, dotabuff, google, theme null (#19)
• Plugins: Add font awesome integration (#45), fill-pattern (#31),
  draggable-points (#28)
• New hchart function. Generic function to chart acf, forecast,
  ts, stl, xts, ohcl objects (#2) (#27)
• In highmaps prevent scrolling when cursor is over the map (#38)
• Import rex-export %>% (#15)
• Heigth scale in the container in rstudio IDE (#14)
• Avoid duplicate css calls (#6)
• Add uscountygeojson, usgeojson, worldgeojson, unemployment data