Adds a script for versioned docs (#3575)
Adds a script for versioned docs (#3575)

Added a script to build versioned documentation
vitaly-krugl/nupic,alfonsokim/nupic,rhyolight/nupic,alfonsokim/nupic,lscheinkman/nupic,scottpurdy/nupic,vitaly-krugl/nupic,scottpurdy/nupic,rhyolight/nupic,ywcui1990/nupic,alfonsokim/nupic,rcrowder/nupic,vitaly-krugl/nupic,scottpurdy/nupic,lscheinkman/nupic,neuroidss/nupic,lscheinkman/nupic,ywcui1990/nupic,numenta/nupic,ywcui1990/nupic,numenta/nupic,subutai/nupic,rhyolight/nupic,neuroidss/nupic,subutai/nupic,subutai/nupic,numenta/nupic,rcrowder/nupic,neuroidss/nupic,rcrowder/nupic