asFloat, asInt enhancements
Merge pull request #92 from TrueNorth/asNumericEnhancements

asFloat, asInt enhancements
Throw proper errors instead of strings.

Also don't rely on prototype extensions for formatting errors
Ensure .typeOf is invoked on an Ember.A
Added proper catogorization in macros yuidoc
Disable prototype extension to reveal hidden errors
#67 - add composable computed property macro support to "among"