Update build to use Tycho 0.19
Update build to use Tycho 0.19

Change-Id: I04663c7c2b14d50a67c284ae5533a19484e3a8cf
Signed-off-by: Matthias Sohn <446760a3fbea85cd5f8f4f5c3de304fe3a38014f@sap.com>
paulvi/egit,collaborative-modeling/egit,wdliu/egit,blizzy78/egit,SmithAndr/egit,collaborative-modeling/egit,wdliu/egit,SmithAndr/egit,paulvi/egit