Fix warnings about unchecked conversion of MergeResult

Change-Id: I1490b2209fa7b39676849c624adbc262a672f6df
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

org.eclipse.jgit.test/tst/org/eclipse/jgit/merge/MergeAlgorithmTest.java

 	}
 
 	private String merge(String commonBase, String ours, String theirs) throws IOException {
-		MergeResult r = new MergeAlgorithm().merge(RawTextComparator.DEFAULT,
+		MergeResult<RawText> r = new MergeAlgorithm().merge(RawTextComparator.DEFAULT,
 				T(commonBase), T(ours), T(theirs));
 		ByteArrayOutputStream bo=new ByteArrayOutputStream(50);
 		fmt.formatMerge(bo, r, "B", "O", "T", Constants.CHARACTER_ENCODING);

org.eclipse.jgit/src/org/eclipse/jgit/merge/MergeFormatter.java

 	 *            metadata
 	 * @throws IOException
 	 */
-	public void formatMerge(OutputStream out, MergeResult res, String baseName,
+	public void formatMerge(OutputStream out, MergeResult<RawText> res, String baseName,
 			String oursName, String theirsName, String charsetName) throws IOException {
 		List<String> names = new ArrayList<String>(3);
 		names.add(baseName);