Initial hacky reactive gravatar templates
Added SkirmishMap#clearOverlays for richard
Refactored city overlay template rendering into seperate method
Broke compileTemplates() and zoomChanged callback out of SkirmishMap#initialize
Merge branch 'develop' of https://github.com/RantGames/skirmish-web into gravatars-on-overlays

Conflicts:
	app.html
Merge pull request #16 from RantGames/gravatars-on-overlays

Fancier overlays