[config] update config.js
[config] update config.js

* don't require HTTPS by default
* don't set max default dataset size (mongo only config option)

most people setting up snorkel should be setting it up behind nginx or
apache, let the proxy do the HTTPS.

logV/snorkel,logV/snorkel,logV/snorkel.sf,logV/snorkel.sf,logV/snorkel.sf,logV/snorkel