Added method to graph groups to set child properties
Added property to set planes doublesided
Updated graphtool example
Merge pull request #299 from virtual-world-framework/branch/grid-tile-visibility

graphtool: plane doubleside prop
Remove Blockly Trash Can (not visible due to scrolling)
Merge pull request #302 from virtual-world-framework/remove-trash-can

Remove Blockly Trash Can
Merge pull request #304 from virtual-world-framework/mars-game-staging

Mars game staging