Add support for XML Signature 1.1 to JSR 105.

The first public working draft of XML Signature 1.1 has been published:

http://www.w3.org/TR/2009/WD-xmldsig-core1-20090226

It includes new algorithm support for ECDSA-SHA1/256/384/512, SHA256/384/512, HMAC-SHA256/384/512, RSA-SHA256/384/512 and other minor enhancements.

The main work item is adding support for ECDSA, as most of the other algorithms are already supported in JDK 7. We should also participate in interop testing which will be coordinated by the W3C XML Security working group.