Mavenize

This should fix #2.

@jrmerz: A couple notes for discussion:

- I wasn't sure what version should be put in the pom file so I left it as-is but I don't think it's correct.  Either let me know what is should be and I'll fix it or you can fix it on your side.
- The pom is setup to build two jars.  I'm not sure what the current best practice is for GWT modules these days but I've seen a few projects that seem to assume people are adding two dependencies two their project: 1) for compiled classes and 2) for the sources.  Let me know your thoughts on this.
- Should the war & examples directories just be deleted?  I think examples should go into separate git repositories?  It doesn't look like they've been updated since the switch to the new package names?