Unable to provide custom execution context

[bambuchaAdm]

On fixing tests i trying to providing custom execution context i found that it's impossible. I made little change in ExecutionContextProvider.scala

    case Failure(ex) =>
      logger.info("No custom execution context found, falling back to scala.concurrent.ExecutionContext.global")
      logger.info("No custom execution context found, falling back to scala.concurrent.ExecutionContext.global", ex)
      scala.concurrent.ExecutionContext.global

and gets

[info] - deadbolt.execution-context - No custom execution context found, falling back to scala.concurrent.ExecutionContext.global
com.google.inject.ProvisionException: Unable to provision, see the following errors:

1) Found a circular dependency involving play.api.Application, and circular dependencies are disabled.
  at play.api.DefaultApplication.class(Application.scala:235)
  while locating play.api.DefaultApplication
  while locating play.api.Application

1 error
	at com.google.inject.internal.InjectorImpl$2.get(InjectorImpl.java:1028)
	at be.objectify.deadbolt.scala.DefaultExecutionContextProvider$$anonfun$1.apply(ExecutionContextProvider.scala:42)

Solution would be injecting injector instead application provider. I made fixes but they depends on #36