Fixed and updated the LICENSE file

LICENSE

@@ -1,15 +1,14 @@
-epel
-====
+Copyright (c) 2013 Kenneth Wilke <kenneth.wilke@rackspace.com>
+Copyright (c) 2014 Carlos Perelló Marín <carlos@pemas.net>
 
-Install the EPEL RPM and GPG key on RHEL 5/6 or CentOS 5/6.
+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
 
-.. note::
+  http://www.apache.org/licenses/LICENSE-2.0
 
-    See the full `Salt Formulas installation and usage instructions
-    <http://docs.saltstack.com/topics/conventions/formulas.html>`_.
-
-Available states
-----------------
-
-``epel``
-    Installs the GPG key and EPEL RPM package for the current OS.
+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.