Include the instance name in the rule id
Include the instance name in the rule id

This fixes #177. The addRules method of definition.js checks rule inheritance using the id of the rule, and only adds rules from ancestors if the id is different. However, without this patch, foo/line-color and bar/line-color have the same id and therefore aren't recognised as applying to different instances.
1ec5/carto,CartoDB/carto,gravitystorm/carto,pnorman/carto,mapbox/carto,CartoDB/carto,tomhughes/carto,whitelynx/carto,clhenrick/carto,midnightcomm/carto,stefanklug/carto,madeinqc/carto