v0.0.3 - New features & less bugs

• Add .nice() options for axis
• Storing parsed data in Grapher.data and leaving Grapher.options.data
  untouched
• Correct bugs when categories are set manually
• Only parse data when required
• Add advanced options to add additional columns to parsed data
• Correct bug on js sorting
• Correcting bug on optimal precision and exposing new static method for
  tickFormatting
• Correct bug for downloading data (missing method to transform to csv
  now added)
• Change the number of ticks on y axis if logscale