Use IN query by passing in array.

when finding the audience, if you look up a particular
column with an array instead of a value, it will execute
an IN sql query, such as IN ['1','2'...]

This fixes a bug where notifications were being sent to
everyone in the database.
Merge recent sprint9 changes.

Merge branch 'sprint9-merge' of github.com:Innovation-Toolkit/midas into sprint9-merge