adding timestamps on contact and connection model
fixed typo in datefield argument
typo in name, makes sense now
Refs #346: Add timestamps to Contact and Connection

Thanks to @xkmato - add created_on and modified_on timestamps
to Contact and Connection.
Also add migration and mention in the release notes.
Refs #346: Fix doc syntax
Merge remote-tracking branch 'xkmato/time_stamps_on_contact' into develop
Merge branch 'feature/346-contact-timestamps' into develop