Add a timeline helper which determines if at least one survey has started.
Add a timeline helper which determines if at least one survey has started.

--HG--
extra : rebase_source : 354a1e06d2f22780f31abed51314c32aafe4c30f

rhyolight/nupic.son,rhyolight/nupic.son,rhyolight/nupic.son