chore(model.js): Allows the key model to be extended
feature(goUsers): Implements the goUsers feature
docs(goUsers): Adds docs for goUsers and new models
chore(examples): update example to use new features
merge(develop): conflicts
chore(connect.js): loginProviders property as an array
Merge pull request #76 from goinstant/colinmacdonald/extend-model

feature(goUsers): Implements the goUsers feature