changing cpp-ethereum to ethash

ethash.h

@@ -1,18 +1,18 @@
 /*
-  This file is part of cpp-ethereum.
+  This file is part of ethash.
 
-  cpp-ethereum is free software: you can redistribute it and/or modify
+  ethash is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.
 
-  cpp-ethereum is distributed in the hope that it will be useful,
+  ethash is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
 
   You should have received a copy of the GNU General Public License
-  along with cpp-ethereum.  If not, see <http://www.gnu.org/licenses/>.
+  along with ethash.  If not, see <http://www.gnu.org/licenses/>.
 */
 
 /** @file ethash.h