Update dependencies

This PR updates the core dependencies.

Reasons for updating dependencies:
- qs was recently released with the __proto__ bugfix (https://github.com/visionmedia/node-querystring/issues/82)
- connect and express released new versions with the updated version of qs
- the qs package caused earlier 0.11 build failures in #1147 which lead us to remove 0.11 from the build