Update used spring version and added Groovy plugin and dependencies

pom.xml

@@ -7,8 +7,8 @@
 	<packaging>war</packaging>
 
 	<properties>
-		<org.springframework-version>3.1.2.RELEASE</org.springframework-version>
-		<org.springframework.security-version>3.1.0.RELEASE</org.springframework.security-version>
+		<org.springframework-version>3.1.3.RELEASE</org.springframework-version>
+		<org.springframework.security-version>3.1.3.RELEASE</org.springframework.security-version>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 		<project.url>https://scm.thm.de/arsnova</project.url>
 	</properties>
@@ -307,6 +307,11 @@
 			<version>2.25.0</version>
 			<scope>test</scope>
 		</dependency>
+		<dependency>
+			<groupId>org.codehaus.groovy</groupId>
+			<artifactId>groovy</artifactId>
+			<version>2.0.5</version>
+		</dependency>
 	</dependencies>
 	<build>
 		<plugins>
@@ -447,6 +452,11 @@
 					</execution>
 				</executions>
 			</plugin>
+			<plugin>
+				<groupId>org.codehaus.mojo</groupId>
+				<artifactId>groovy-maven-plugin</artifactId>
+				<version>1.4</version>
+			</plugin>
 		</plugins>
 	</build>