Added tracking preference
Added Tracker class
Added tracker to controller
Renamed polygon to PolygonRenderer; Added polygon (as a list of points)
Added collision polygons to scene element
Updated techdemo to use collision polygons in triangle
Added test for collision polygons
Fixes #131
Merge pull request #210 from anserran/fix131

Fixes #131
Merge pull request #205 from anserran/addga

Added basic implementation for editor tracker
Revert "Fixes after changes in libgdx API"

This reverts commit 844bc3a03d7f5c8fa19c8d58bc93e8ca3c2983e7.
Merge pull request #213 from anserran/revertlibgdxfix

Revert "Fixes after changes in libgdx API"
Added template class to create schema objects
Fixing a couple of broken scenes in tech demo
Removed comment; improved collision polygon test
Merge pull request #4 from jtorrente/pr/208

Fixing a couple of broken scenes in tech demo
Merge pull request #208 from anserran/collision-polygons

Added collision polygons to scene elements
Adding tracking and modelversion properties to release.json schema
Fixing additional properties in release.json
Adding a model version to the EditorGame schema