Revert "Remove the CLI gradle build in Travis CI (#232)" (#234)

This reverts commit ddea5c9095f3798305320181247abafa41b7abc1.
diff --git a/tools/travis/build.sh b/tools/travis/build.sh
index 845a0bb..fe80906 100755
--- a/tools/travis/build.sh
+++ b/tools/travis/build.sh
@@ -32,6 +32,8 @@
 
 cd $WHISKDIR
 
+TERM=dumb ./gradlew tools:cli:distDocker -PdockerImagePrefix=openwhisk
+
 cd $WHISKDIR/ansible