fixed team membership views to work non-POST
fixed team membership views to work non-POST

pyconca/2013-web,faulteh/symposion,pyconau2017/symposion,euroscipy/symposion,miurahr/symposion,mbrochh/symposion,pinax/symposion,pydata/symposion,pyconca/2013-web,pyohio/symposion,miurahr/symposion,python-spain/symposion,toulibre/symposion,pydata/symposion,pyohio/symposion,toulibre/symposion,python-spain/symposion,euroscipy/symposion,pinax/symposion,TheOpenBastion/symposion,mbrochh/symposion,faulteh/symposion,pyconau2017/symposion,NelleV/pyconfr-test,NelleV/pyconfr-test,TheOpenBastion/symposion