perf($q): move Deferred and Promise methods to prototypes

Opening PR for tests and comparison with other solutions for `$q` perf.

NOTE: Deferred doesn't get all the advantages of moving methods to the prototype,
since the constructor binds instance methods to "this" to support unbounded execution.

NOTE: This change increases the gzipped version by 100 bytes.
I added a simpleBind function, and wrote a jsperf to compare with angular.bind and native bind: http://jsperf.com/angular-bind-vs-custom-vs-native