Add interactive ACE editor in the example pages.
Update reference
Added documentation for data.keys, data.mimetype, data.columns, data.rows, data.json, data.url.
Merge branch 'aendrew-adding_data_methods'
Build reference
Merge branch 'master' of https://github.com/lukethenuke/c3js.org into lukethenuke-master
Merge branch 'lukethenuke-master'
Build with ace editor
Added include for theme-tomrrow.js and mode-javascript.js.