Update license information

In other words, thou shalt not copy-paste a LICENSE file.

LICENSE

@@ -1,4 +1,4 @@
-Copyright (c) 2006-2015 Doctrine Project
+Copyright (c) 2015 alcaeus
 
 Permission is hereby granted, free of charge, to any person obtaining a copy of
 this software and associated documentation files (the "Software"), to deal in

composer.json

@@ -3,6 +3,7 @@
     "type": "library",
     "description": "Adapter to provide ext-mongo interface on top of mongo-php-libary",
     "keywords": ["mongodb", "database"],
+    "license": "MIT",
     "authors": [
         { "name": "alcaeus", "email": "alcaeus@alcaeus.org" }
     ],