localDocker.py now works on ubuntu 18.04 image (see note)
the original invocation of the autodriver redirected output as cmd &> outfile; but this fails in a autograder built on ubuntu 18.04 with a message:
An error occurred while parsing the autoresult returned by the Autograder.
Error message: 795: unexpected token at '---'
The fix applied here (do: cmd > output 2>&1 ) is also suggested by issue 153 on cmu's tango repo: https://github.com/autolab/Tango/issues/153
Closes #2