Merge pull request #25 from tansaku/develop

fixing bugs in late message testing
autograders.yml no longer in repo
things we need for the migration grader
getting git to forget about config/autograders.yml
Merge pull request #26 from tansaku/migration_grader

Migration grader
Refactored cli step to refer to regex constants in autograder_subprocess; and fixed failing specs
Merge branch 'develop' into command_line
match includes singular test, fixed feature and step, create /tmp/log
match beginning of line
Merge pull request #4 from apelade/pullreq_tansaku_command_line

command_line branch from ping-pong