Clean up website assets that are auto-generated

website/default.html

website/harness/$FAIL.js

website/harness/$PRINT.js

website/harness/Date_constants.js

website/harness/Date_library.js

website/harness/Test262Error.js

website/harness/accessorPropertyAttributesAreCorrect.js

website/harness/arrayContains.js

website/harness/compareArray.js

website/harness/cth.js

website/harness/dataPropertyAttributesAreCorrect.js

website/harness/ed.js

website/harness/environment.js

website/harness/fnExists.js

website/harness/fnGlobalObject.js

website/harness/framework.js

website/harness/gs.js

website/harness/helper.js

website/harness/jquery-1.4.2.min.js

website/harness/jquery.base64.js