Add taco command - build for selected device(s) using pseudo

... and I can finally just type "taco mako"

PS2: Serve with multiple sauces (eg. taco mako grouper)

Change-Id: I5c0ee3300cf5d646ccfdcdf1c45474df74fceee3
Signed-off-by: Gergely Szell (sethyx) <szell@hu.ibm.com>