Fix ExpandImport ordering
Fix ExpandImport ordering

It should be called sooner, otherwise some analysis choke on an unknown
identifiers which turns out to be a name imported from a module.

pbrunet/pythran,serge-sans-paille/pythran,hainm/pythran,hainm/pythran,pombredanne/pythran,artas360/pythran,pombredanne/pythran,pbrunet/pythran,pombredanne/pythran,pbrunet/pythran,serge-sans-paille/pythran,artas360/pythran,artas360/pythran,hainm/pythran