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.
Reload graders' config after sleep on edx client

Every time edx_client wakes from sleep it reloads the autograders'
config.
Initial specs for feature.

Unit tests for private methods load_due_date load_grace_period.
Fix specs for load_due_date and load_grace_period
Add part specific due_date grace_period capability

Now load_due_date and load_grace_period have the below priority:
1)Part specific due date and grace period in autograders config file
2)Assignment specific due date and grace period in autograders config
3)Default values in EdXClient

If part_name is not supplied in load_due_date or load_grace_period,
they revert back to their previous version
Merge pull request #11 from gspilio/unable_to_parse_fix

Unable to parse fix
Merge pull request #12 from gspilio/reload_config

Reload config
travis
More exhaustive tests for run with timeout
Fix unable_to_parse bug as reported by SJoseph.

This bug has another aspect that becomes apparent when we read
the output of the spawned process so slow, that the process
terminates long before we read its whole output. This alone is
not bad, however the condition thread.alive? was used in the while
loop. This led to the premature termination of run_with_timeout.
To make travis update the build
Merge branch 'unable_to_parse_fix' into per_exercise_due_date_and_grace_period
Merge pull request #18 from gspilio/unable_to_parse_fix

Unable to parse fix
Merge pull request #19 from gspilio/per_exercise_due_date_and_grace_period

Per exercise due date and grace period
hotfixes to make assignment part due dates work - need to write tests that properly check this
specs wrapping strings in assignment part configuration and fix to grace period in assignment part configuration
adding some extra details for testing the homeworks and config for Oracle of bacon assignment
test
added space in rspec file
wrote failing spec about :late_period