Hash the sid in mongo. So if the db be hacked. The sid won't be release. Improve the security.
enable customise hash algorithm
update read me
update test file, so easy to set the test mongodb to different server host
Hash the sid in mongoDB. It's optional. Salt and algorithm are customisable. All test passed.
Hash the sid in mongoDB. It's optional. Salt and algorithm are customisable. All test passed.
change test back to localhost mongo
update git ignore. ignore node_module folder
ignore node_module
Revert "ignore node_module"

This reverts commit 2b1dc90d575f79d6931eca803dcbc6bf2b859912.
update git ignore
Merge pull request #107 from ZheFeng/master

Hash sid in mongo