Progress on draw toolbar (measure, import/export and colour selection)
Add text background. Put area label in the polygon's centroid.
Add erase selected and undo erase. Add colour picker and panel.
Add text background as text symbol to solve zoom problems. Correct JSHint errors.
Merge branch 'master' of https://github.com/GeoCanViz/GeoCanViz into measure-json

Conflicts:
	src/js/gistasks/gisCluster.js
	src/js/gistasks/gisGeoprocessing.js
	src/js/gistasks/gisMapUtility.js
	src/js/sass/includes/toolbarnav.scss
Merge pull request #36 from jolevesq/measure-json

Measure json