A bit of docstring reworking, fixed password and key_filenames stuff
Only add defaults if defaults is set.
Import tweaks, make backward-compatible wrapper use old-style lookups
Fix a silly bug in the py2 reraise wrapepr
Fix a number of logic errors, add support for key_filenames parameter, make all _lookup_missing args mandatory
Fix a lot of import troubles
Fixed a bunch of stupid crap
key_filename -> key_filenames