Signature: Renamed file signature.js to sha256-with-rsa-signature.js. Renamed class Signature to Sha256WithRsaSignature and added a deprecated Signature which inherits it. Refs #1805.
Deprecated the Signature class. Added Sha256WithRsaSignature. Refs #1805.
Sha256WithRsaSignature: In getElementLabel, don't rename the DTag Signature.
Signature: In the rest of the library, use Sha256WithRsaSignature instead of the deprecated Signature. Refs #1805.
Merge branch 'issue/1805-rename-to-Sha256WithRsaSignature'. Refs #1805.
http://redmine.named-data.net/issues/1805