bump django 1.9 to rc1 for tests
bump django 1.9 to rc1 for tests

patrys/opbeat_python,patrys/opbeat_python,patrys/opbeat_python,patrys/opbeat_python,beniwohli/apm-agent-python,beniwohli/apm-agent-python,beniwohli/apm-agent-python,beniwohli/apm-agent-python