Upgrade to Jetty 9.4.0.RC0 and POI 3.15

Author: jhoeller

build.gradle

@@ -59,7 +59,7 @@ configure(allprojects) { project ->
 	ext.jaxbVersion            = "2.2.11"
 	ext.jaxwsVersion           = "2.2.11"
 	ext.jcaVersion             = "1.7"
-	ext.jettyVersion           = "9.4.0.M1"
+	ext.jettyVersion           = "9.4.0.RC0"
 	ext.jmsVersion             = "2.0.1"
 	ext.jodaVersion            = "2.9.4"
 	ext.jpaVersion             = "2.1.1"
@@ -73,7 +73,7 @@ configure(allprojects) { project ->
 	ext.nettyVersion           = "4.1.5.Final"
 	ext.okhttpVersion          = "2.7.5"
 	ext.okhttp3Version         = "3.4.1"
-	ext.poiVersion             = "3.14"
+	ext.poiVersion             = "3.15"
 	ext.protobufVersion        = "3.0.2"
 	ext.quartzVersion          = "2.2.3"
 	ext.reactivestreamsVersion = "1.0.0"