Allow service names to be capitalized

Angular doesn't prohibit capitalized service names, although ngdocs does not correctly parse services with capitalized names (#77).  

This change does require capitalized `Type`s to be explicitly declared as `@ngdoc type`, although I can't find any instances of anybody actually relying on the current functionality.

I'm not particularly fond of the way that we sniff out services/types/providers/modules by using regular expressions alone.  This portion of `ngdocs.js` may need to be completely refactored at some point down the road.