Bioscons

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* commands submitted to SLURM are wrapped in sh -c "..."
* be more careful about running Commands locally unless use_culster is True

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* added ``bioscons.slurm``

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* added ``infernal.align_and_merge``

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* added ``pplacer.pplacer`` and ``pplacer.align_and_place``
* added ``infernal.cmalign_method`` and ``infernal.cmmerge_method`` (these will replace other builders in this module)
* renamed ``refpkg.get_vars`` to ``refpkg.get_varlist``
* environment variables defined by ``refpkg.get_varlist`` are prepended by 'refpkg_'