Refs #299: Adds ability for students to see the members of a event audience via a modal, if they are a member of said audience.
Refs #299: Adds audience visibility option to learning event edit page.
Refs #299: Bringing branch in line with develop
Moved database upgrades into a later folder and changed the version_db setting in the install/upgrade scripts.
Merge branch 'develop' of https://github.com/EntradaProject/entrada-1x into feature-group-members

Conflicts:
	www-root/setup/install/sql/entrada.sql
Merge branch 'develop' into feature-group-members
Brings feature-group-members in line with develop.
Adds back getEventAudience, replaces fetch row with get.
Wraps audience entry list in is_array check to fix php error when audience exists, but has no members attached.
Merge pull request #420 from EntradaProject/feature-group-members

Group members & audience visibility