Newest lib versions and new gradle/wrapper

.gradle/2.2.1/taskArtifacts/cache.properties

@@ -1 +0,0 @@
-#Tue May 26 17:53:04 CEST 2015

.gradle/2.3/taskArtifacts/cache.properties

@@ -1 +0,0 @@
-#Wed May 27 09:37:38 CEST 2015

build.gradle

@@ -4,7 +4,7 @@ buildscript {
    dependencies { classpath(libraries.spring_boot_gradle_plugin) }
    repositories { jcenter() }
 }
-apply plugin: 'spring-boot'
+apply plugin: 'org.springframework.boot'
 
 repositories { jcenter() }
 
@@ -39,6 +39,10 @@ dependencies {
    testCompile libraries.spring_boot_starter_test
    testCompile libraries.jsonassert
    testCompile libraries.jsonpath
+   testCompile libraries.dropwizard_metrics_core
+   testCompile(libraries.cassandra_unit_spring)  {
+      exclude group: 'com.codahale.metrics', module: 'metrics-core'
+   }
 }
 
 uploadArchives {