Allow session to be passed in directly

Added statement to "getStore" to check if the passed in variable is a reference to session itself or a reference to connect/express in order to support changes within Express 4.0
Bumping version, update mongodb to latest

Bumping to version 0.1.0 due to the change to the API that is backwards compatible which supports passing in session directly or connect/express. Moving mongodb version to 1.4.0 (latest) which fixes many issues, one including a memory leak.
Updated to reflect express 4.x changes
Add changelog to keep track of future changes
Merge branch 'master' of github.com:KyleRoss/connect-mongostore into KyleRoss-master

Conflicts:
	lib/connect-mongostore.js
Merge branch 'KyleRoss-master'