Added the missing Touch class

The TouchList contains TouchEvent in stead of Touch objects as described in the spec. https://developer.mozilla.org/en-US/docs/Web/API/TouchList.

I have added the missing class and changed the wrong References. Don't mind my changes in the build files. I could not exclude them from the pull request. 

It is tested it for Android. See https://build.phonegap.com/apps/924534/share
and the code in https://github.com/wwagner4/doctus/blob/master/scalajs/src/main/scala/doctus/scalajs/DoctusScalajs.scala Line 133ff and https://github.com/wwagner4/doctus/blob/master/scalajs-showcase/src/main/scala/doctus/scalajs/Showcase.scala Line 38, 39