import CMap/LINCS data

[andrewsu]

CMap should provide gene expression measurements associated with chemical compounds. In theory, that data should be accessible via https://clue.io/cmap, but on first glance it is unclear how one can actually access these data (via either downloadable files or API). Needs someone to dig through the links (including the GEO records mentioned in https://clue.io/GEO-guide and this user guide).

Also, I believe CMap and LINCS are a partially overlapping set of data. Would also be good to import LINCS -- more info probably available at http://www.lincsproject.org/.

This ticket is partially motivated by a request from the alpha translator team, so they should be notified when we have more info...