Fixed fabric.PathGroup.fromObject - use fabric.util.enlivenObjects to instatiate fabric.Path objects
Corrected jsdoc tags for fabric.PathGroup.fromObject, fabric.Path.fromObject and fabric.Path.fromElement
Fixed quint tests for fabric.Path and fabric.PathGroup
Merge pull request #755 from Kienz/loadFromJSONFix

Fix `fabric.PathGroup.fromObject`