relation: fix jshint warnings
example: update for recent boot changes

Modify the signature of the function exported from `models/location.js`
to use the new one-argument format. Use `RentalLocation.base` to access
the base model.
model: set `base` depending on connector used

Configure a correct base model depending on what datasource/connector
the new model is attached to.
Merge pull request #22 from strongloop/feature/last-minute-changes

Last minute changes