Author check tool displays what institution you're from

@singingwolfboy 
Do we really have this information for *everyone* that has an institutional agreement? Would it be better to say:
```python
elif agreement == "institution":
    institution = people[username].get("institution")
    msg = u"{} is covered by an institutional agreement".format(username)
    if institution:
        msg += u"with {}".format(institution)
    print_green(msg)
```