ENH: for 2.5 -- need to install simplejson for fail2ban
BF: actually for fail2ban master we should not try 2.5 -- not supported ;-)
ENH/BF: make schedulers for created builders

This makes it possible to avoid duplication of specification of builders
by removing necessity to explicitly creating schedulers for regular builds.
Testing for now only on fail2ban and pymvpa -- if everything is ok, would
adjust for the rest