- Added new AchievementLookup class.
- Refactored the classes in the Data.CharacterAchievements and Data.GuildAchievements namespaces to use the schema in the Achievements namespace instead.  Now the AchievementLookup, CharacterAchievements, and GuildAchievements class all use the same schema and LibWowAPI objects to represent individual achievements.
- Improved exception handling.
- Added Achievement Lookup to the demo project.