Update copyrights for 2014.

grep -rl 'Copyright 2013 Facebook' static_upstream | xargs perl -pi -w -e s/Copyright 2013 Facebook/Copyright 2013-2014 Facebook/g;'

Not going to check in a script to do this since it will just change every year.
Closes #1006

_js/html-jsx-lib.js

@@ -1,5 +1,5 @@
 /**
- * Copyright 2013 Facebook, Inc.
+ * Copyright 2013-2014 Facebook, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.

_js/html-jsx.js

@@ -1,5 +1,5 @@
 /**
- * Copyright 2013 Facebook, Inc.
+ * Copyright 2013-2014 Facebook, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.