Change postgres npm module name
Change postgres npm module name

With `sails-postgres`:
```
npm ERR! 404 Registry returned 404 for GET on https://registry.npmjs.org/sails-postgres
npm ERR! 404 
npm ERR! 404 'sails-postgres' is not in the npm registry.
```

`sails-postgresql` works fine:
https://www.npmjs.com/package/sails-postgresql
Multicolour/multicolour-example,newworldcode/multicolour-example