Reassign copyright to Exercism legal entity

LICENSE

@@ -1,6 +1,6 @@
-The MIT License (MIT)
+MIT License
 
-Copyright (c) 2014 Katrina Owen, _@kytrinyx.com
+Copyright (c) 2017 Exercism, Inc
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal