Cell types - get empirical distribution for tool performance table

ct_get_empirical_dist

Version	Tool Shed	Owner	Galaxy instances where the tool is available
1.1.1+galaxy0	toolshed.g2.bx.psu.edu	ebi-gxa	usegalaxy.eu
1.1.0+galaxy1	toolshed.g2.bx.psu.edu	ebi-gxa	usegalaxy.eu
1.0.0+galaxy1	toolshed.g2.bx.psu.edu	ebi-gxa	usegalaxy.eu