Update Spring to 4.3.30.RELEASE

Closes gh-1918

Author: jgrandja

pom.xml

@@ -19,7 +19,7 @@
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <commons-codec.version>1.14</commons-codec.version>
-    <spring.version>4.3.26.RELEASE</spring.version>
+    <spring.version>4.3.30.RELEASE</spring.version>
     <spring.security.version>4.2.15.RELEASE</spring.security.version>
     <spring.data.redis.version>1.5.2.RELEASE</spring.data.redis.version>
     <redis.clients.version>2.6.3</redis.clients.version>

tests/annotation/pom.xml

@@ -27,7 +27,7 @@
 	<properties>
 		<start-class>demo.Application</start-class>
 		<java.version>1.7</java.version>
-		<spring.version>4.3.26.RELEASE</spring.version>
+		<spring.version>4.3.30.RELEASE</spring.version>
 	</properties>
 
 	<name>spring-oauth2-tests</name>

tests/xml/pom.xml

@@ -21,7 +21,7 @@
 	<properties>
 		<start-class>demo.Application</start-class>
 		<java.version>1.7</java.version>
-		<spring.version>4.3.26.RELEASE</spring.version>
+		<spring.version>4.3.30.RELEASE</spring.version>
 	</properties>
 
 	<name>spring-oauth2-tests-xml</name>