Revert "Delete .travis.yml"

This reverts commit 24894b32.

.travis.yml

+language: generic
+sudo: required
+dist: trusty
+os:
+    - linux
+env:
+    - COMPILE_TYPE=CPU DOCKERFILE_CPU=$PWD/tools/Dockerfile.ci
+services:
+    - docker
+before_install:
+    - docker build -f ${DOCKERFILE_CPU} -t serving-img:${COMPILE_TYPE} .
+install:
+    - if [ $COMPILE_TYPE == "CPU" ]; then docker run -it -v $PWD:/Serving serving-img:${COMPILE_TYPE} /bin/bash Serving/tools/serving_check_style.sh ; fi;
+    - docker run -it -v $PWD:/Serving serving-img:${COMPILE_TYPE} /bin/bash Serving/tools/serving_build.sh $COMPILE_TYPE