Minor sample build changes. JSTL dependency update.

samples/tutorial/tutorial.gradle

@@ -16,4 +16,8 @@ dependencies {
             project(':spring-security-config'),
             project(':spring-security-taglibs'),
             'log4j:log4j:1.2.15@jar'
+}
+
+jettyRun {
+    contextPath = "/tutorial"
 }