Add toString to Git with repository path

Useful for debugging.

Change-Id: I78b92ccbcc099370fc99a1d2fa2cf60d5f5892e6
Signed-off-by: Robin Stocker <robin@nibor.org>

org.eclipse.jgit/src/org/eclipse/jgit/api/Git.java

 		return repo;
 	}
 
+	@Override
+	public String toString() {
+		return "Git[" + repo + "]"; //$NON-NLS-1$//$NON-NLS-2$
+	}
 }