Update for Play 2.3 (as of M1)

 - Fix compilation errors related to BodyParser
 - Change SimpleResult to Result
 - add `message` and `since` args to deprecation warning on Auth trait
 - Tweak webdriver constructor in tests
 - Tweak DB tables to fix H2 index-on-text column error

Note: Play and SBT versions are 2.3-M1 and 0.13.5-M2 respectively.