Added test to verify blame commits can have multiple lines.
Added test to verify blame commits can have multiple lines.

See #47

breavo/GitPython,gitpython-developers/gitpython,zsjohny/GitPython,dpursehouse/GitPython,roidelapluie/GitPython,jeblair/GitPython,pengshp/GitPython,manasdk/GitPython,beni55/GitPython,ghtdak/GitPython,pengshp/GitPython,avinassh/GitPython,h4ck3rm1k3/GitPython,pengshp/GitPython,nvie/GitPython,StyXman/GitPython,cdht/GitPython,gitpython-developers/gitpython,ghtdak/GitPython,nvie/GitPython,avinassh/GitPython,gitpython-developers/GitPython,roidelapluie/GitPython,zsjohny/GitPython,bwrsandman/GitPython,hvnsweeting/GitPython,breavo/GitPython,avinassh/GitPython,dpursehouse/GitPython,cdht/GitPython,cdht/GitPython,manasdk/GitPython,bwrsandman/GitPython,StyXman/GitPython,h4ck3rm1k3/GitPython,jeblair/GitPython,bwrsandman/GitPython,expobrain/GitPython,beni55/GitPython,expobrain/GitPython,zsjohny/GitPython,hvnsweeting/GitPython,StyXman/GitPython,gitpython-developers/GitPython