Clarify licensing

*Needs review.* This pull request clarifies the licensing of the Web Font Loader. Previously the copyright was assigned to Small Batch Inc. This pull request removes the example appendix from the LICENSE file and appends it to the README.md. At the same time the Copyright is assigned to Adobe Systems Incorporated and Google Incorporated. This change has been reviewed by Adobe's legal department.

@raziel @jeremiele Are you OK with these changes? It doesn't change the actual license, but does more clearly specify the copyright owners (in this case, both Adobe and Google.)