upgrade dependency versions

Author: graemerocher

build.gradle

@@ -40,15 +40,15 @@ ext {
     jansiVersion = "1.11"
     jlineVersion = "2.12"
     jnaVersion = "4.0.0"
-    slf4jVersion = "1.7.10"
+    slf4jVersion = "1.7.21"
     reactorCoreVersion = '2.0.8.RELEASE'
     reactorVersion = '2.0.7.RELEASE'
 
     spockVersion = '1.0-groovy-2.4'
     springBootVersion = "1.3.7.RELEASE"
     springLoadedVersion = "1.2.6.RELEASE"
     springLoadedCommonOptions = "-Xverify:none -Dspringloaded.synchronize=true -Djdk.reflect.allowGetCallerClass=true"
-    springVersion = "4.2.6.RELEASE"
+    springVersion = "4.2.7.RELEASE"
     ehcacheVersion = "2.4.6"
     junitVersion = "4.12"
     concurrentlinkedhashmapVersion = "1.4.2"