Information about users is hard to find in the UI

[markwhiting]

Problem

We often need to find a particular user and understand the experience they had on the platform. The most common thing we need is:

1. to search by mturk ID,
2. to check if they've been paid, and bonus them if they haven't.

Solution

I propose that we add a few changes to make this much easier.

1. a search field which allows entering an mturk ID and just returns any records we have of that user on https://bang.stanford.edu/users
2. a payment column which shows how much we've paid that worker

A nice to have would be:

3. A bonus button so we could just bonus that worker directly from the users ui.

[dtatarenkov]

added bonus button and total bonuses to users tab