Update blueprints.js: add populate as an option

With the new relations in waterline, I think it's really important that users
can easily turn off the populate option as ajax api calls can quickly get
out-of-hand with big data sets
Merge branch 'patch-1' of github.com:campbellwmorgan/sails-generate-backend into campbellwmorgan-patch-1

Conflicts:
	templates/config/blueprints.js