align shared files copyright/comments to bitcoinj's

src/java/org/bitcoin/Secp256k1Context.java

@@ -1,8 +1,24 @@
+/*
+ * Copyright 2014-2016 the libsecp256k1 contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package org.bitcoin;
 
 /**
  * This class holds the context reference used in native methods 
-   to handle ECDSA operations.
+ * to handle ECDSA operations.
  */
 public class Secp256k1Context {
   private static final boolean enabled; //true if the library is loaded