Fix a slowdown caused by mutation of an incoming accessToken option.
Merge pull request #341 from STRML/fixAccessTokenMutatedOptions

Fix a slowdown caused by mutation of an incoming accessToken option.
Remove relationNameFor
Update juggler dep
Merge pull request #342 from strongloop/feature/refactor-relation

Upgrade to loopback-datasource-juggler 1.6
Update link to doc
Merge branch 'master' of github.com:strongloop/loopback