Conda/standard shell script dual compatibility 

So this update allows Polyphemus servers to handle conda and traditional build scripts simultaneously, and to easily switch between them via the `batlab_build_type='conda'` rc option.  As an example, I just launched this version of polyphemus and here is a

shell script cyclus run: http://submit-1.batlab.org/nmi/results/details?runID=266319
conda script cycamore run: http://submit-1.batlab.org/nmi/results/details?runID=266318
does this need a default argument (as was stated in the help)?