Remove Leaflet map when its directive destroys
Cancel time interval objct in TimeDisplay directive when the directive destroys
Destroy FPS meters in Simular controller when the controller destroys
Update SonarGraph and PlotGraphs
Merge branch 'master' into features/eugene/memory-leaks

Conflicts:
	www/js/game/controllers/simulator/mission.tpl.html
	www/js/game/directives/sonarBearing/sonarBearing.js
	www/js/game/services/plotGraphs/plotGraphs.js
	www/js/game/services/sonarGraph/sonarGraph.js
Fix rzslider directive
Merge pull request #92 from IanMayo/features/eugene/memory-leaks

Eugene's very clever fixes for memory leaks