Fix __sink and pysb reaction numbering bugs
Fix __sink and pysb reaction numbering bugs

sorgerlab/rasmodel,jmuhlich/ras_model,sorgerlab/ras_model,jmuhlich/rasmodel,subkar/rasmodel,johnbachman/ras_model,johnbachman/rasmodel,jmuhlich/ras_model,johnbachman/rasmodel,johnbachman/ras_model,sorgerlab/ras_model,sorgerlab/rasmodel,jmuhlich/rasmodel