Save Customer.default_source on post-save hook instead of pre-save
Save Customer.default_source on post-save hook instead of pre-save

This avoids an infinite loop when saving a Customer with a Card as the
default_source, which saves the Card with a Customer as the parent,
which saves the Card...

dj-stripe/dj-stripe,tkwon/dj-stripe,jameshiew/dj-stripe,tkwon/dj-stripe,kavdev/dj-stripe,jameshiew/dj-stripe,dj-stripe/dj-stripe,pydanny/dj-stripe,pydanny/dj-stripe,kavdev/dj-stripe,jleclanche/dj-stripe,jleclanche/dj-stripe