fix(http): cannot use JSONP_BINDINGS and HTTP_BINDINGS in same injector

[jeffbcross]

If I create an injector as follows, Http will use the JsonpBackend instead of XHRBackend.

var injector = Injector.resolveAndCreate([HTTP_BINDINGS, JSONP_BINDINGS]);
var http = injector.get(Http);
http.get('foo.json'); // Would use JSONP Backend.

This is because both injectables bind the abstract ConnectionBackend class to their own specific implementation.

This should be able to be easily fixed by binding Jsonp and Http to factories that have dependencies on concrete backends instead of overriding the ConnectionBackend bindings.

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