NorthwindContext: Added TimeGroups query
BreezeNHQueryableAttribute: now gets Session from the IQueryable, instead of Request property.
Refactoring BreezeQueryableAttribute functions into helper class.
Moved BreezeQueryableAttribute functions into QueryHelper class
Moved BreezeNHQueryableAttribute functions into NHQueryHelper class
Refactored QueryHelper and BreezeQueryableAttribute
Moved logic from BreezeNHQueryableAttribute into BreezeQueryableAttribute
Merge branch 'master' of https://github.com/IdeaBlade/Breeze
Merged QueryHelper version with existing codebase