TwICE v1.0.0 released

TwICE is a Java implementation of the Information and Content Exchange (ICE) protocol version 1.1. It implements an ICE syndicator (publisher) and ICE subscriber. TwICE may be useful as a reference implementation or a public syndicator and subscriber for testing.

Changes: Push syndication. Subscription states now sent, updated, and honored. The test syndicator will respond with code 202 (Package sequence state already current) when appropriate. Each subscription now has its own target URL. A payload's ice-sender will now contain the sender's ``listener'' URL in the location attribute. Code refactored. Still needs more, though.

Bug fixes: Added required subscription-id attribute to ice-package. Subscribers weren't being restored properly on the syndicator side; the names were not being loaded. Catalogs returned from syndicators improperly returned the listener URL as the catalog URL, which should only be used for human-readable catalog retrieval.