feat(core): provide support for relative assets for components

Assets defined for `templateUrl` and `styleUrls` can now be loaded
in relative to where the component file is placed so long as the
`moduleId` is set within the component annotation.

Closes #5634

Closes #5634

modules/angular2/test/facade/lang_spec.ts

@@ -65,5 +65,59 @@ export function main() {
       });
     });
 
+    describe('stripLeft', () => {
+      it('should strip the first character of the string if it matches the provided input', () => {
+        var input = "~angular2 is amazing";
+        var expectedOutput = "angular2 is amazing";
+
+        expect(StringWrapper.stripLeft(input, "~")).toEqual(expectedOutput);
+      });
+
+      it('should keep stripping characters from the start until the first unmatched character',
+         () => {
+           var input = "#####hello";
+           var expectedOutput = "hello";
+           expect(StringWrapper.stripLeft(input, "#")).toEqual(expectedOutput);
+         });
+
+      it('should not alter the provided input if the first charater does not match the provided input',
+         () => {
+           var input = "+angular2 is amazing";
+           expect(StringWrapper.stripLeft(input, "*")).toEqual(input);
+         });
+
+      it('should not do any alterations when an empty string or null value is passed in', () => {
+        expect(StringWrapper.stripLeft("", "S")).toEqual("");
+        expect(StringWrapper.stripLeft(null, "S")).toEqual(null);
+      });
+    });
+
+    describe('stripRight', () => {
+      it('should strip the first character of the string if it matches the provided input', () => {
+        var input = "angular2 is amazing!";
+        var expectedOutput = "angular2 is amazing";
+
+        expect(StringWrapper.stripRight(input, "!")).toEqual(expectedOutput);
+      });
+
+      it('should not alter the provided input if the first charater does not match the provided input',
+         () => {
+           var input = "angular2 is amazing+";
+
+           expect(StringWrapper.stripRight(input, "*")).toEqual(input);
+         });
+
+      it('should keep stripping characters from the end until the first unmatched character',
+         () => {
+           var input = "hi&!&&&&&";
+           var expectedOutput = "hi&!";
+           expect(StringWrapper.stripRight(input, "&")).toEqual(expectedOutput);
+         });
+
+      it('should not do any alterations when an empty string or null value is passed in', () => {
+        expect(StringWrapper.stripRight("", "S")).toEqual("");
+        expect(StringWrapper.stripRight(null, "S")).toEqual(null);
+      });
+    });
   });
 }