Changes

Update to Tycho 2.2.0

As Tycho 2.2.0 has been releases, SWTBot can use this version for its
build. Tested locally can seem to work fine.

Also moves to the new feature-source which has be migrated from
tycho-extras to regular tycho.

Change-Id: I85e56db4eb7bd26db0d59222b5e4580f2e6be9ed
Signed-off-by: Lars Vogel <Lars.Vogel@vogella.com>