Allow file without filetype as long as they end in ".py".
Allow file without filetype as long as they end in ".py".

Added a -D flag (can really only be specified on OSX commandline) to not
revector sys.stderr, for debugging the IDE itself. Not sure whether
this should stay.

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator