Bump Groovy to 2.5 to easy Eclipse IDE integration

Author: Jerome Revillard

build.gradle

@@ -41,8 +41,8 @@ dependencies {
     processor 'org.inferred:freebuilder:2.5.0'
 
     testCompile group: 'junit', name: 'junit', version: '4.12'
-    testCompile group: 'org.codehaus.groovy', name: 'groovy-all', version: '2.4.4'
-    testCompile group: 'org.spockframework', name: 'spock-core', version: '1.0-groovy-2.4'
+    testCompile group: 'org.codehaus.groovy', name: 'groovy-all', version: '2.5.14'
+    testCompile group: 'org.spockframework', name: 'spock-core', version: '1.2-groovy-2.5'
     testCompile group: 'cglib', name: 'cglib-nodep', version: '2.2'
     testCompile group: 'com.github.stefanbirkner', name: 'system-rules', version: '1.19.0'
     testCompile group: 'org.skyscreamer', name: 'jsonassert', version: '1.5.0'