Update spec javadoc to findbugs 2.0.3
Update pom; add Confidence, deprecate Priority

- Update pom for findbugs 2.0.3
- Add new class Confidence
- Deprecate use of Priority
Add SuppressFBWarnings

Add SuppressFBWarnings class and deprecate SuppressWarnings.
Update sources to match 2.0.3 spec.

Various changes including:
- mark some classes as @Deprecated
- add fields for num, rank, confidence
- add missing defaults
- use fully qualified names to avoid some warnings
Merge pull request #1 from glucas/v2.0.3

Add new branch for FindBugs v2.0.3