Add deprecated TraversableOnce aliases
Add deprecated TraversableOnce aliases

Fixes https://github.com/scala/collection-strawman/issues/552
scala/scala,scala/scala,lrytz/scala,lrytz/scala,scala/scala,martijnhoekstra/scala,lrytz/scala,martijnhoekstra/scala,lrytz/scala,lrytz/scala,martijnhoekstra/scala,martijnhoekstra/scala,lrytz/scala,scala/scala,martijnhoekstra/scala,martijnhoekstra/scala,scala/scala,scala/scala