Upgraded to work with the Eventuate client framework version 0.12

See http://eventuate.io/docs/java/spring-configuration.html for details on new configuration properties.
Upgraded to Spring Boot 1.2.8
Misc changes to build scripts

scala-spring/accounts-command-side-backend/build.gradle

@@ -1,5 +1,5 @@
 dependencies {
     compile "org.scala-lang:scala-library:2.10.2"
     compile project(":common-backend")
-    compile "net.chrisrichardson.eventstore.client:eventstore-client-event-handling:$eventStoreClientVersion"
+    compile "net.chrisrichardson.eventstore.client:eventstore-client-event-handling_2.10:$eventStoreClientVersion"
 }