18: Updated Oomph setup for Xtext 2.17
18: Updated Oomph setup for Xtext 2.17

Task-Url: http://github.com/LorenzoBettini/packtpub-xtext-book-2nd-examples/issues/18
LorenzoBettini/packtpub-xtext-book-2nd-examples,LorenzoBettini/packtpub-xtext-book-2nd-examples,LorenzoBettini/packtpub-xtext-book-2nd-examples,LorenzoBettini/packtpub-xtext-book-2nd-examples