Added my 2 cents on filenames

I think this approach (the one we're currently using) makes our app an Angular app, when we should be thinking of it as a JavaScript app. In a JavaScript app, the case of all filenames would match the case of the variable names of whatever they export - so most of them would be lower camel case, except files exporting classes, which would be upper camel case. But I'll merge this if a majority of people like it. @yitznewton @littlebigbot @dazz @sashless @rwos