Revert "Travis fix to clear exceptions."

.travis.yml

@@ -3,8 +3,8 @@ jdk:
   - oraclejdk8
 #  blacklist
 branches:
-  only:
-    - master
+  except:
+    - gh-pages
 before_cache:
   - rm -f $HOME/.gradle/caches/modules-2/modules-2.lock
 cache: