Changes to graph tiling:
- added support for quadtree decomposition to force-directed layout algo
- added more whitespace padding around raw nodes during layout of lowest hierarchical level communities
- minor bug fix for saved community layout results
Refactored code so that layers are responsible for publishing changes to their state. Removed LayerMediator classes. Refactored and fixed minor styling and css issues.
Refactored layer isolation code in main to ensure zIndex order matches config file layer order.
Moved quadtree decomposition algo from tile-generation to geometric-utilities project
Merge pull request #26 from oculusinfo/graph_tiling_20141003

Changes to graph tiling:
Fixed server configuration race condition bug. Refactored client layer factory. Fixed twitter-topics example for changes made to pubsub. Other minor refactoring.
Merge branch 'develop'