Fix travis-ci build
Fix travis-ci build

paera/django-static-precompiler,liumengjun/django-static-precompiler,paera/django-static-precompiler,jaheba/django-static-precompiler,jaheba/django-static-precompiler,jaheba/django-static-precompiler,jaheba/django-static-precompiler,liumengjun/django-static-precompiler,liumengjun/django-static-precompiler,paera/django-static-precompiler,liumengjun/django-static-precompiler,liumengjun/django-static-precompiler,paera/django-static-precompiler