perf(expressionProperties): 🌟 Don't fire digest for every runExpressions call

Because we're using  to assign the value, this will run in  which means only one digest
for all the  that are running 😀

closes #406

Author: Kent C. Dodds

src/directives/formly-field.js

@@ -69,7 +69,7 @@ function formlyField($http, $q, $compile, $templateCache, $interpolate, formlyCo
             setter(field, value);
           });
         });
-      });
+      }, 0, false);
     }
 
     function valueGetterSetter(newVal) {
@@ -168,7 +168,6 @@ function formlyField($http, $q, $compile, $templateCache, $interpolate, formlyCo
       }
 
       formControl.$render();
-      // REMOVE UNDEFINED CHECK WHEN DROPPING ANGULAR 1.2 SUPPORT
       formControl.$setUntouched && formControl.$setUntouched();
       formControl.$setPristine();