In order to get arround the migration 18 issue we execute table's
alteration connecting directly with PostgresSQL engine through adapter.
Tabultions fixed
Removed filter storage for EditableGrid and moved tooltip initialization

to layout
Down task added for migration (I've missed)
Merge pull request #75 from fiuba/fix-grid-filtering

Removed filter storage for EditableGrid and moved tooltip initialization
Sender for correction notification email is teacher
Get support email from env var and use it for auto corrections sender
Merge pull request #77 from fiuba/fix-notification-emails-sender

Fix notification emails' sender
Merge pull request #76 from fiuba/fixing_migration_18_issue

Fixing migration 18 issue
Rename assignment_generic_files only if assignment_files doesn't exists
Added teacher's name on from field for notification emails
Merge branch 'develop' into fixing_correction_fields_type_on_db