feat($httpParamSerializerJQLike): honor object.toJSON function if present.

Author: gabrielmaldi

src/ng/http.js

@@ -111,7 +111,7 @@ function $HttpParamSerializerJQLikeProvider() {
           forEach(toSerialize, function(value) {
             serialize(value, prefix + '[]');
           });
-        } else if (isObject(toSerialize) && !isDate(toSerialize)) {
+        } else if (isObject(toSerialize) && !isFunction(toSerialize.toJSON)) {
           forEachSorted(toSerialize, function(value, key) {
             serialize(value, prefix +
                 (topLevel ? '' : '[') +