Node update

[cadecairos]

This PR Fixes an issue with the original PR (#395) where the key that a related model was saved to got changed from older Sequelize versions.

It also contains many dependency updates to fix security issues, including changes to get the server running properly on Express 4.x

[gideonthomas]

let me know when this is ready for re-review @cadecairos

[cadecairos]

@gideonthomas will do. after many experiments I've now turned to downloading the travis-ci docker images (3.5 GB :/) so I can try to replicate the problem locally.

[gideonthomas]

oh dear! Ok good luck!

[cadecairos]

Hmm looks like it fails because of mysql