Add create-update post component.

src/main/java/org/codiki/posts/PostService.java

@@ -65,7 +65,7 @@ public class PostService {
 		return result;
 	}
 	
-	public void update(final PostDTO pPost, final HttpServletRequest pRequest,
+	public void update(final Post pPost, final HttpServletRequest pRequest,
 			final HttpServletResponse pResponse, final Principal pPrincipal) throws IOException {
 		final Optional<User> connectedUser = userService.getUserByPrincipal(pPrincipal);