fixed PowerToughness pattern
 * removed the card's 'type' attribute
 * added a unique key for card name
 * moved set name to an element
 * moved card rarity to an element
added JAXB processing of the card descriptor schema, and .gitignore for the generated artifacts
added a "test" that just dumps the usage information for the CLI so 'mvn test' can succeed directly out of Git
Merge remote-tracking branch 'origin/master'