Merging in my initial refactoring. Upped the version number to 0.5

- Change Plugin name (ReportManager => CustomReporting)
- Change Model name (Report => CustomReport)
- Add a model *whitelist* to offer more restrictions
- Reports now saved to database as opposed to filesystem
- Make *saving* a report a more deliberate action
- Redo treatment of hasMany and hasAndBelongsToMany associations
- Add report duplication
- Tweak the default styles
- Various bug fixes & refactoring