Make side panel for graph vis stats - WIP

- Need better layout manager - side panel and graph vis should not be equal size
- Need to add rest of stats
- Update README Gradle version
Better vis layout with BoxLayout

- BoxLayout respects comp pref size
- Still needs cleanup
- http://stackoverflow.com/a/18407341
Improve stats panel for vis

- Better look
- Added leader believes elec comp stat, believers counter stat
    - Aside: possible bug in believers counter reporting
Minor cleanup + TODO update
Add getAgentWithID() to ExtendedNode class