Update deps / allowed 0.11 failure

This PR updates the core dependencies and brings back 0.11 builds as allowed failures.

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

Reasons re-adding 0.11 as allowed_failure:
- We can reduce the number of incompatibilities we introduce 
- Currently 0.11 messes up on Travis (https://github.com/joyent/node/issues/6556, https://github.com/isaacs/npm/issues/4257)