Add branch identifier "play23" to project version
Add missing async-http-client dependency
Uppgrade to Play 2.3.4
Upgrade to async-http-client 1.8.14
Merge branch 'play23'
Revert "Add branch identifier "play23" to project version"

This reverts commit e25d908d3d82da341a52104c1ceeb791b507ef69.