Added generatePom task

This can be used to generate the pom.xml for adding the Spring Security
snapshot jars as a Maven Dependency to another project. For example,
if mywebapp requires the Spring Security 3.1.4.CI-SNAPSHOT jars one
could generate the pom.xml files and then use that to convert the project
into a valid Maven project within the IDE. Then the SNAPSHOT dependendies
could be added to mywebapp. This prevents the need to install the SNAPSHOT
dependencies in the local Maven repository.

gradle/maven-deployment.gradle

@@ -95,3 +95,20 @@ def customizePom(pom, gradleProject) {
         }
     }
 }
+
+task generatePom {
+    group = 'Build'
+    description = 'Generates the Maven pom.xml'
+
+    ext.generatedPomFileName = 'pom.xml'
+
+    inputs.files('**/*.gradle')
+    outputs.files(generatedPomFileName)
+
+    doLast() {
+        def p = pom {}
+        customizePom(p, project)
+        p.writeTo(generatedPomFileName)
+    }
+
+}