v1.1.0
Merge branch 'release/1.1.0' into production
Merge tag 'v1.1.0'

1.1.0

 * Format the code (Raymond Feng)

 * Fix behaviour for custom user model, remove debug output (Pandaiolo)

 * Compliance with loopback 2.x models declaration (Pandaiolo)

 * Add contribution guidelines (Ryan Graham)

 * Use html to scale image (Rand McKinney)

 * Scale image (Rand McKinney)

 * Replace README with link to docs. (Rand McKinney)

 * Move the callback scope up one level so that customCallback option has access to res and req. Otherwise it's impossible to do anything like redirects within it. (Frank Carey)