If brim is ungracefully shutdown the zqd process launched by brim continues on. There should be some functionality in zqd (or mode for running zqd) where zqd will terminate if the parent Brim process ceases to exist.

Steps to reproduce:

1. Start brim
2. Find brim pid
3. Run kill -9 $brimpid
4. Observe that the brim launched zqd process is still running ps aux | grep zqd

Note: This does not appear to be a problem on the Windows version of Brim.