regenerated with Xtext 2.4 from latest

Change-Id: I32cf593a708d881e395ef4b3c8b328ba80e2bb50
updated build files for Kepler and Xtext 2.4 latest

Change-Id: I500dcbe90bdf475022a686689ecc3a12bf8a305b
use XImportSection

Change-Id: Ic839d32a827fffbe2c54fb1269209e85cf7764a8