Update experiment.py

add in skeleton of the spikeins audit
Holding version of buildout.py until it gets fixe
Accepting Nikhil version
Merge remote-tracking branch 'origin/master' into 1635-spikes-audit
Update experiment.py

Trying to tidy up code to find the error in the AuditFailure line.
Fixed the audit failure
Cricket needs a heart to heart about is not versus !=
Merge pull request #487 from ENCODE-DCC/1635-spikes-audit

1635 spikes audit