push secure social jar with support for play 2.6 to maven

[AndrewKL]

According to maven the latest version of secure social only supports Play 2.6. It seems as though a new version from the master branch is needed.

https://mvnrepository.com/artifact/ws.securesocial/securesocial_2.11
https://github.com/jaliss/securesocial/blob/master/ChangeLog