doc: add io.js LICENSE block

PR-URL: #294

LICENSE

@@ -1,7 +1,32 @@
-Node's license follows:
+io.js is licensed for use as follows:
 
 ====
 
+Copyright io.js contributors. All rights reserved.
+
+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.
+
+===
+
+This license applies to parts of io.js originating from the
+https://github.com/joyent/node repository:
+
 Copyright Joyent, Inc. and other Node contributors. All rights reserved.
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to
@@ -23,8 +48,8 @@ IN THE SOFTWARE.
 
 ====
 
-This license applies to all parts of Node that are not externally
-maintained libraries. The externally maintained libraries used by Node are:
+This license applies to all parts of io.js that are not externally
+maintained libraries. The externally maintained libraries used by io.js are:
 
 - V8, located at deps/v8. V8's license follows:
   """
@@ -555,7 +580,7 @@ maintained libraries. The externally maintained libraries used by Node are:
     included for use in the npm website and documentation,
     used with permission.
 
-    This program uses several Node modules contained in the node_modules/
+    This program uses several io.js modules contained in the node_modules/
     subdirectory, according to the terms of their respective licenses.
   """