makefile: added a new task for run the coverage.
makefile: added a new task for run the coverage.

drptbl/splinter,bubenkoff/splinter,bmcculley/splinter,nikolas/splinter,underdogio/splinter,underdogio/splinter,myself659/splinter,lrowe/splinter,gjvis/splinter,underdogio/splinter,objarni/splinter,bmcculley/splinter,drptbl/splinter,drptbl/splinter,bubenkoff/splinter,bmcculley/splinter,lrowe/splinter,cobrateam/splinter,lrowe/splinter,gjvis/splinter,nikolas/splinter,nikolas/splinter,cobrateam/splinter,objarni/splinter,myself659/splinter,gjvis/splinter,cobrateam/splinter,objarni/splinter,myself659/splinter