refactor(ProtoViewBuilder): improve error message for dangling bindings

Closes angular#3066

Author: pkozlowski-opensource

modules/angular2/src/render/dom/view/proto_view_builder.ts

@@ -322,7 +322,7 @@ function buildElementPropertyBindings(protoElement: /*element*/ any, isNgCompone
       propertyBindings.push(propertyBinding);
     } else if (!SetWrapper.has(directiveTempaltePropertyNames, propertyNameInTemplate)) {
       throw new BaseException(
-          `Can't bind to '${propertyNameInTemplate}' since it isn't a know property of the '${DOM.tagName(protoElement).toLowerCase()}' element and there are no matching directives with a corresponding property`);
+          `Can't bind to '${propertyNameInTemplate}' since it isn't a known property of the '<${DOM.tagName(protoElement).toLowerCase()}>' element and there are no matching directives with a corresponding property`);
     }
   });
   return propertyBindings;

modules/angular2/test/core/compiler/integration_spec.ts

@@ -1283,7 +1283,7 @@ export function main() {
 
                      PromiseWrapper.catchError(tcb.createAsync(MyComp), (e) => {
                        expect(e.message).toEqual(
-                           `Can't bind to 'unknown' since it isn't a know property of the 'div' element and there are no matching directives with a corresponding property`);
+                           `Can't bind to 'unknown' since it isn't a known property of the '<div>' element and there are no matching directives with a corresponding property`);
                        async.done();
                        return null;
                      });

modules/angular2/test/render/dom/view/proto_view_builder_spec.ts

@@ -31,7 +31,7 @@ export function main() {
           builder.bindElement(el('<div/>')).bindProperty('unknownProperty', emptyExpr());
           expect(() => builder.build())
               .toThrowError(
-                  `Can't bind to 'unknownProperty' since it isn't a know property of the 'div' element and there are no matching directives with a corresponding property`);
+                  `Can't bind to 'unknownProperty' since it isn't a known property of the '<div>' element and there are no matching directives with a corresponding property`);
         });
 
         it('should allow unknown properties if a directive uses it', () => {
@@ -53,7 +53,7 @@ export function main() {
           binder.setComponentId('someComponent');
           expect(() => builder.build())
               .toThrowError(
-                  `Can't bind to 'unknownProperty' since it isn't a know property of the 'some-custom' element and there are no matching directives with a corresponding property`);
+                  `Can't bind to 'unknownProperty' since it isn't a known property of the '<some-custom>' element and there are no matching directives with a corresponding property`);
         });
 
       });