0.6.0 - performance and cleanup

What's Changed

• Feature/tooling interactive mode by @iamdudeman in #148
• Cleanup/sola entity graphics module by @iamdudeman in #149
• Cleanup/particle system code by @iamdudeman in #150
• Cleanup/more javadocs by @iamdudeman in #151
• Feature/broad phase quad tree by @iamdudeman in #152
• Feature/gui followup improvements by @iamdudeman in #153
• Improved performance of JsCanvasUtils#renderToCanvas by @iamdudeman in #154
• QuadTreeBroadPhase is now the default broad phase for CollisionDetecionSystem by @iamdudeman in #155

Full Changelog: 0.5.2...0.6.0