Fix exclusions that were not showing up in generated poms

This was due to Gradle's silent failure to match exclusions detailed
at http://jira.codehaus.org/browse/GRADLE-1028. Everything is working
as expected now after this update, however.

build.gradle

@@ -305,10 +305,10 @@ project('spring-integration-security') {
         compile "org.springframework:spring-aop:$springVersion"
         compile "org.springframework:spring-tx:$springVersion"
         compile("org.springframework.security:spring-security-core:$springSecurityVersion") {
-            exclude(module: 'spring-support')
+            exclude group: 'org.springframework', module: 'spring-support'
         }
         compile("org.springframework.security:spring-security-config:$springSecurityVersion") {
-            exclude(module: 'spring-support')
+            exclude group: 'org.springframework', module: 'spring-support'
         }
     }
 }
@@ -366,7 +366,7 @@ project('spring-integration-ws') {
         compile "org.springframework.ws:spring-ws-core:$springWsVersion"
         compile("javax.xml.soap:saaj-api:1.3") {
             optional = true
-            exclude(module: 'activation')
+            exclude group: 'javax.activation', module: 'activation'
         }
         compile("com.sun.xml.messaging.saaj:saaj-impl:1.3") { optional = true }
         compile("javax.activation:activation:$javaxActivationVersion") { optional = true }