potential fix for issue 218
potential fix for issue 218
add comment referencing issue 218
test for issue 218
use weakref.proxy instead of weakref.ref
update
add some comments
remove bogus 'pass'
rename README to README.md
fix typo in comment
use nc-config by default
update url in setup.py to point to github instead of googlecode
don't try to print fill info for non-primitive data types
take out outdated restriction on diskless files
Merge pull request #219 from jswhit/master

potential fix for issue 218 (circular references preventing garbage collection)