added zope.testbrowser to Makefile
added zope.testbrowser to Makefile

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