ensure addition to .bashrc in setup.sh is idempotent

Signed-off-by: Jacob Emmert-Aronson <jre2718@berkeley.edu>
Don't error out in setup.py if directories already exist.

Signed-off-by: Jacob Emmert-Aronson <jre2718@berkeley.edu>
mysql requires user and password when accessing test database

Signed-off-by: Jacob Emmert-Aronson <jre2718@berkeley.edu>
Merge pull request #7 from jre21/master

Cleanups for dev environment