Run docker cross compiler on Travis CI

.travis.yml

@@ -1,9 +1,12 @@
+sudo: required
+
+services:
+  - docker
+
 language: scala
 
-sudo: false
-
 scala:
-   - 2.11.7
+  - 2.11.8
 
 jdk:
   - openjdk6
@@ -11,4 +14,14 @@ jdk:
   - oraclejdk7
   - oraclejdk8
 
-script: ./sbt test
+script:
+  - if [ "$TRAVIS_JDK_VERSION" == "oraclejdk8" ]; then
+      if [ "$TRAVIS_PULL_REQUEST" == "false" ]; then
+        # Build all native libraries
+        make native-all && ./sbt test
+      else
+        ./sbt test;
+      fi;
+    else
+      make linux64 && ./sbt test;
+    fi