[fix] Node 0.8 did not default to null, but undefined. So just check if it's exists.
[minor] Remove some unused variables
Merge pull request #3 from lpinca/remove/unused-variables

Remove some unused variables
[minor] Make use of the credentials variable
[minor] Re-add the credentials variable ;p
[doc] Improve readme, document all options correctly
[fix] Use delta seconds instead of miliseconds
[dist] 0.0.2
[minor] Fix a comment