Added MIT License, added notes regarding license in lib and readme

Author: carlsverre

LICENSE

@@ -0,0 +1,20 @@
+Copyright (c) 2012 Carl Sverre
+
+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 the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be included
+in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

lib/mixpanel-node.js

@@ -2,7 +2,9 @@
     Heavily inspired by the original js library copyright Mixpanel, Inc.
     (http://mixpanel.com/)
 
-    Modifications by Carl Sverre
+    Copyright (c) 2012 Carl Sverre
+
+    Released under the MIT license.
 */
 
 var http            = require('http'),

readme.md

@@ -42,4 +42,10 @@ Attribution/Credits
 Heavily inspired by the original js library copyright Mixpanel, Inc.
 (http://mixpanel.com/)
 
-Modifications by Carl Sverre
+Copyright (c) 2012 Carl Sverre
+
+License
+-------------------
+
+Released under the MIT license.  See file called LICENSE for more
+details.