Play 2.6 Upgrade

• Upgrade Play 2.2.0 to 2.2.6
• https://www.playframework.com/documentation/2.5.x/Migration23
• https://www.playframework.com/documentation/2.5.x/Migration24
  • http://www.silhouette.rocks/ - Secure Social replacement
    • example: https://github.com/adrianhurt/play-silhouette-credentials-seed
• https://www.playframework.com/documentation/2.5.x/Migration25
• https://www.playframework.com/documentation/2.6.x/Migration26

Sbt migration: http://www.scala-sbt.org/0.13/docs/Migrating-from-sbt-012x.html