Upgrade django-extensions to 1.5.5
Upgrade django-extensions to 1.5.5

Edraak/edx-ora2,nttks/edx-ora2,ubc/edx-ora2,ubc/edx-ora2,Lektorium-LLC/edx-ora2,nttks/edx-ora2,Edraak/edx-ora2,Stanford-Online/edx-ora2,EDUlib/edx-ora2,edx/edx-ora2,Edraak/edx-ora2,miptliot/edx-ora2,Stanford-Online/edx-ora2,edx/edx-ora2,Lektorium-LLC/edx-ora2,Stanford-Online/edx-ora2,edx/edx-ora2,nttks/edx-ora2,Stanford-Online/edx-ora2,ubc/edx-ora2,Edraak/edx-ora2,EDUlib/edx-ora2,ubc/edx-ora2,edx/edx-ora2,miptliot/edx-ora2,nttks/edx-ora2,EDUlib/edx-ora2,EDUlib/edx-ora2,Lektorium-LLC/edx-ora2,miptliot/edx-ora2,miptliot/edx-ora2,Lektorium-LLC/edx-ora2