remove _blueprint_order, dicts are ordered
remove _blueprint_order, dicts are ordered

This code originates from supporting Python 2.4. Dicts are ordered in
supported Pythons as of 3.6. An OrderedDict could be used to indicate
that order matters, but is not since we don't rely on the implementation
differences.

drewja/flask,fkazimierczak/flask,drewja/flask,pallets/flask,fkazimierczak/flask,mitsuhiko/flask,pallets/flask,pallets/flask,fkazimierczak/flask,mitsuhiko/flask,drewja/flask