Add Travis Build

Fixes gh-3753

.travis.yml

@@ -0,0 +1,20 @@
+language: java
+
+jdk:
+  - oraclejdk8
+
+os:
+  - linux
+
+branches:
+  only:
+    - master
+
+before_cache:
+  - rm -f $HOME/.gradle/caches/modules-2/modules-2.lock
+cache:
+  directories:
+    - $HOME/.gradle/caches/
+    - $HOME/.gradle/wrapper/
+
+script: ./gradlew build

README.adoc

@@ -1,5 +1,7 @@
 image::https://badges.gitter.im/Join%20Chat.svg[Gitter,link=https://gitter.im/spring-projects/spring-security?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge]
 
+image:https://travis-ci.org/spring-projects/spring-security.svg?branch=master["Build Status", link="https://travis-ci.org/spring-security/spring-security"]
+
 = Spring Security
 
 Spring Security provides security services for the http://docs.spring.io[Spring IO Platform]. Spring Security 3.1 requires Spring 3.0.3 as