Add OWFa v1.0 license agreement to GraphQL specification. (#368)

* Add OWFa v1.0 license agreement to GraphQL specification.

Find the full text of the agreement: http://www.openwebfoundation.org/legal/the-owf-1-0-agreements/owfa-1-0

Read more about this change at: https://medium.com/@leeb/relicensing-the-graphql-specification-e7d07a52301b

Resolves #351

* Add signed agreement

package.json

@@ -6,7 +6,7 @@
     "Nicholas Schrock <schrockn@fb.com>",
     "Daniel Schafer <dschafer@fb.com>"
   ],
-  "license": "BSD",
+  "license": "OWFa-1.0",
   "homepage": "https://facebook.github.io/graphql",
   "bugs": {
     "url": "https://github.com/facebook/graphql/issues"

spec/GraphQL.md

@@ -16,32 +16,30 @@ match their [release tag](https://github.com/facebook/graphql/releases).
 
 **Copyright notice**
 
-Copyright (c) 2015-2017, Facebook, Inc. All rights reserved.
-
-Redistribution and use in source and binary forms, with or without modification,
-are permitted provided that the following conditions are met:
-
- * Redistributions of source code must retain the above copyright notice, this
-   list of conditions and the following disclaimer.
-
- * Redistributions in binary form must reproduce the above copyright notice,
-   this list of conditions and the following disclaimer in the documentation
-   and/or other materials provided with the distribution.
-
- * Neither the name Facebook nor the names of its contributors may be used to
-   endorse or promote products derived from this software without specific
-   prior written permission.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
-ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
-DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
-ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
-(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
-LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
-ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+Copyright © 2015-present, Facebook, Inc.
+
+As of September 26, 2017, the following persons or entities have made this
+Specification available under the Open Web Foundation Final Specification
+Agreement (OWFa 1.0), which is available at [openwebfoundation.org](http://www.openwebfoundation.org/legal/the-owf-1-0-agreements/owfa-1-0).
+
+Facebook, Inc.
+
+You can review the signed copies of the Open Web Foundation Final Specification
+Agreement Version 1.0 for this specification at [github.com/facebook/graphql](https://github.com/facebook/graphql/tree/master/signed-agreements),
+which may also include additional parties to those listed above.
+
+Your use of this Specification may be subject to other third party rights.
+THIS SPECIFICATION IS PROVIDED “AS IS.” The contributors expressly disclaim any
+warranties (express, implied, or otherwise), including implied warranties of
+merchantability, non-infringement, fitness for a particular purpose, or title,
+related to the Specification. The entire risk as to implementing or otherwise
+using the Specification is assumed by the Specification implementer and user.
+IN NO EVENT WILL ANY PARTY BE LIABLE TO ANY OTHER PARTY FOR LOST PROFITS OR ANY
+FORM OF INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES OF ANY CHARACTER
+FROM ANY CAUSES OF ACTION OF ANY KIND WITH RESPECT TO THIS SPECIFICATION OR ITS
+GOVERNING AGREEMENT, WHETHER BASED ON BREACH OF CONTRACT, TORT (INCLUDING
+NEGLIGENCE), OR OTHERWISE, AND WHETHER OR NOT THE OTHER PARTY HAS BEEN ADVISED
+OF THE POSSIBILITY OF SUCH DAMAGE.
 
 
 **Conformance**