Added release target to the Makefile
Added release target to the Makefile

To release new splinter version, just run:

    % make release version=x.y.z

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