I picked up 2.0.0-alpha.47 and immediately stumbled over en exception that `©` was an unknown entity, but [w3scools](http://www.w3schools.com/html/html_entities.asp) as the top link of a search contained that entity. Consider adding at least those entities from w3schools to [the list](https://github.com/angular/angular/blob/36a423fac8866e8a849cf3ab1c4a15d08b0ccb8c/modules/angular2/src/compiler/html_tags.ts#L7)
