Bury zeromq import until needed to avoid OSX error
Bury zeromq import until needed to avoid OSX error

OSX currently erroring out when run on OSX due to zeromq package errors.
Since zmq import not required unless using ipython, this avoids it on
start to try and work around issue.

vladsaveliev/bcbio-nextgen,chapmanb/bcbio-nextgen,biocyberman/bcbio-nextgen,biocyberman/bcbio-nextgen,lbeltrame/bcbio-nextgen,brainstorm/bcbio-nextgen,chapmanb/bcbio-nextgen,brainstorm/bcbio-nextgen,vladsaveliev/bcbio-nextgen,a113n/bcbio-nextgen,brainstorm/bcbio-nextgen,a113n/bcbio-nextgen,lbeltrame/bcbio-nextgen,chapmanb/bcbio-nextgen,vladsaveliev/bcbio-nextgen,biocyberman/bcbio-nextgen,lbeltrame/bcbio-nextgen,a113n/bcbio-nextgen