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.
WIP of CSV mapper for draft schedule importation.
Moves CSV Importer to autoloader compatible class, start of updates to importer class.
Refs #281: WIP draft event cdv importer interface and updates to CsvImporter class.
Refs #299: Bringing branch in line with develop
Merge branch 'develop' of github.com:EntradaProject/entrada-1x into feature-csv-col-mapper
Adds draft model and supporting models, updates interfaces to use new models.
Refs #281: Minor update to CSV import to use model rather than query, and adds supporting method to model.
Refs #281: Addresses original reason for ticket: when the event's audience type is a course group, and that course group has a tutor attached, the import script adds that tutor to the event, so the tutor can be credited.
Refs #281: Fixes bug where draft option changes were not being saved.
Ref #280 Updated the gradebook module to disable assessments rather than actually deleting them when removing them in the interface.
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
adds assessment_events table to the install sql file. Refs #392
Adds AssessmentEvent model. Refs #392
Merge branch 'develop' into feature-assessment-events
Resolves merge conflict
Adds Event model, AssessmentEvent model, minor ui updates and starts the js to handle attaching a learning event to an assessment. Refs #392
Merge branch 'develop' into feature-assessment-events