Don't override Field.name if already set
Allow callable default for Fields
Use dict.iteritems instead of dict.items
Merge branch 'patch-2' of https://github.com/tahajahangir/mongotor into develop
Merge branch 'patch-3' of https://github.com/tahajahangir/mongotor into develop
Update Makefile
Add suport to torando 3.0 using async connection method

Closes #19
add new version to tox
do makefile more verbose
export nosetests as xunit