Tweaks to travis

.travis.yml

@@ -1,8 +1,25 @@
 language: java
 jdk:
   - openjdk8
-deploy:
-  provider: script
+
+before_cache:
+  - rm -f  $HOME/.gradle/caches/modules-2/modules-2.lock
+  - rm -fr $HOME/.gradle/caches/*/plugin-resolution/
+cache:
+  directories:
+    - $HOME/.gradle/caches/
+    - $HOME/.gradle/wrapper/
+
+jobs:
+  include:
+    - stage: check
+      script: ./gradlew check
+    - stage: publish
       script: ./gradlew build publish
       on:
         branch: master
+
+stages:
+  - check
+  - name: publish
+    if: env(ACCESS_KEY)