better message for not implemented error (#101)
better message for not implemented error (#101)

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