Added the hw5 grading capability to lib/auto_grader_subprocess
Merge pull request #8 from saasbook/auto_grader_subprocess_fix

Added the hw5 grading capability and esacping to lib/auto_grader_subprocess
Fix unable to parse error(As reported by SJoseph)

Ignore EOFError raised by stderrout.read_nonblock, since with
sufficiently big stdout, small stderrout and small buffer_size, err
will reach EOF before the stdout is completely read. This would
cause the graders output to be truncated.
Remove unnecessary comments.
Merge pull request #11 from gspilio/unable_to_parse_fix

Unable to parse fix