Override cloneNode to upgrade cloned elements before DOM insertion

- Also added a test for cloneNode
add license and CLA
add patents file
fix line ending
Merge pull request #29 from azakus/master

Override for CustomElement cloneNode
unified test for whether or not a node can be added to the main document. Helps address https://github.com/Polymer/polymer/issues/155.
add AUTHORS file
Merge pull request #39 from Polymer/master

6/5 master -> stable