Merge pull request #99 from jaredbischof/master

Updates to node and user Initlialize functions
Merge pull request #100 from jaredbischof/master

Want to set acl to empty array rather than returning null if empty
Merge pull request #101 from jaredbischof/master

Closing mongodb session connections
Changed mongodb connections to use 'defer session.Close()' which more reliably closes the session.  And renamed collection handles from 'DB' to 'c'