fixed django 1.4 support when getting user model path
fixed django 1.4 support when getting user model path

ttyS15/pybbm,ttyS15/pybbm,just-work/pybbm,hovel/pybbm,zekone/dj_pybb,skolsuper/pybbm,artfinder/pybbm,jonsimington/pybbm,springmerchant/pybbm,zekone/dj_pybb,webu/pybbm,just-work/pybbm,jonsimington/pybbm,springmerchant/pybbm,katsko/pybbm,wengole/pybbm,skolsuper/pybbm,DylannCordel/pybbm,artfinder/pybbm,skolsuper/pybbm,jonsimington/pybbm,webu/pybbm,wengole/pybbm,artfinder/pybbm,hovel/pybbm,DylannCordel/pybbm,wengole/pybbm,onecue/pybbm,zekone/dj_pybb,NEERAJIITKGP/pybbm,webu/pybbm,springmerchant/pybbm,ttyS15/pybbm,just-work/pybbm,onecue/pybbm,onecue/pybbm,NEERAJIITKGP/pybbm,katsko/pybbm,katsko/pybbm,DylannCordel/pybbm,NEERAJIITKGP/pybbm,hovel/pybbm