update license
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dart-archive/polymer_elements,bwu-dart-contributing/polymer_elements,ErikGrimes/polymer_elements_content_shell_issue,bwu-dart-contributing/polymer_elements,vsheyanov/polymer_elements,jakemac53/polymer_elements,dart-archive/polymer_elements,dart-archive/polymer_elements,ErikGrimes/polymer_elements_content_shell_issue,ronlobo/polymer_elements,dart-archive/polymer_elements,bwu-dart-contributing/polymer_elements,jakemac53/polymer_elements,vsheyanov/polymer_elements,ronlobo/polymer_elements,ronlobo/polymer_elements,dart-archive/polymer_elements,dart-archive/polymer_elements,jakemac53/polymer_elements,ErikGrimes/polymer_elements_content_shell_issue,vsheyanov/polymer_elements