Build out query holding classes to not pollute services
 - Also a generic way to create column mappings for any entity
Merge branch 'hibernate-replacement-strategy' into replace-hibernate
Changing select query to no longer be static
Refactoring `ConferenceService` to use `ConferenceQueries` queries
Changing `PageService` to use `PageQueries`
Adding a query to look up all blocks on a page
Updating `BlockService` to use `BlockQueries`