API-1213 updated travis configuration

Author: edgarjimenez

.travis.yml

@@ -1,14 +1,19 @@
-
 sudo: false
 language: scala
 scala:
-- 2.11.6
+- 2.11.7
 jdk:
 - oraclejdk8
 cache:
   directories:
     - '$HOME/.ivy2/cache'
-branches:
-  except:
-    - master
-    
+notifications:
+  email: false
+
+before_script:
+  - "export DISPLAY=:99.0"
+  - "sh -e /etc/init.d/xvfb start"
+  - sleep 3 # give xvfb some time to start
+
+script:
+  - sbt ++$TRAVIS_SCALA_VERSION test acceptance:test