Upgrade to Spring Framework 4.3.17 snapshots.

See gh-252.

pom.xml

@@ -20,7 +20,7 @@
 
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-		<spring.version>4.3.15.RELEASE</spring.version>
+		<spring.version>4.3.17.BUILD-SNAPSHOT</spring.version>
 		<java.version>1.6</java.version>
 		<project.type>multi</project.type>
 		<dist.id>spring-vault</dist.id>
@@ -54,6 +54,16 @@
 		<url>https://build.spring.io/browse/SPRINGVAULT-VAULT</url>
 	</ciManagement>
 
+	<repositories>
+		<repository>
+			<id>spring-libs-snapshot</id>
+			<url>https://repo.spring.io/libs-snapshot</url>
+			<snapshots>
+				<enabled>true</enabled>
+			</snapshots>
+		</repository>
+	</repositories>
+
 	<developers>
 		<developer>
 			<id>sgibb</id>