Add Audit Table and Trigger function

[usingtechnology]

Hook business, contact, location to audit on update/delete. Required adding an updatedBy userstamp on each of the tables/models. Allows us to see who actually changed the records in the audit record.

Add a wholesale PUT/Update function similar to the IPC POST, only update specific fields in location for now (start date, end date).

Based on Audit Trigger PostgreSQL Wiki.

Description

Types of changes

Checklist

• [x] I have read the CONTRIBUTING doc
• [x] I have checked that unit tests pass locally with my changes
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] I have added necessary documentation (if appropriate)

Further comments

[jujaga]

Included in #103