Update build to use Tycho 0.7.0

Change-Id: Ie4133083a1cb1730f3dba52c0b8d359c7ed845e6
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

org.eclipse.jgit.packaging/pom.xml

@@ -59,7 +59,7 @@
   <name>JGit Tycho Parent (Incubation)</name>
 
   <properties>
-    <tycho-version>0.6.0</tycho-version>
+    <tycho-version>0.7.0</tycho-version>
     <eclipse-site>http://download.eclipse.org/releases/galileo</eclipse-site>
   </properties>