cache reorg, and we now store files by hash, and in subdirs...

also import urlparse as we use it a lot...

might be too little, so I'm bumping this, though it's not active yet..

make sure that extra modules don't get loaded..

so that when a future item imports by the alias, it gets the same module
instead of rerunning the module/code again..

drop a place holder test as it got written..

when a dictionary is missing a key, make sure it gets deleted when
test setting it...

value return the same module, so the same code doesn't get imported
multiple times..

in preparation to add support for configuring this module..

load_aliases for raw data, such as non-package imports..

one because the IPv6 address seems to hang often right now..

isn't found in the cache..

currently always reread the cache directory, but this needs to be
fixed..