Add protoc install

Author: feiskyer

.travis.yml

@@ -1,11 +1,19 @@
+sudo: required
+dist: trusty
+
 language: go
 
 matrix:
   include:
     - go: 1.6
 
+install:
+  - sudo apt-get update -qq
+  - hack/install-protoc.sh
+
 script: 
   - cd ${TRAVIS_BUILD_DIR}
   - hack/verify-gofmt.sh
   - hack/verify-generated-proto.sh
   - make
+

hack/install-protoc.sh

@@ -0,0 +1,16 @@
+#!/bin/bash
+which yum>/dev/null
+if [[ $? != 0 ]]; then
+  sudo apt-get install -y unzip
+else
+  sudo yum install -y unzip
+fi
+
+
+# Install protoc
+cd /tmp
+curl -sSL https://github.com/google/protobuf/releases/download/v3.0.0-beta-3/protoc-3.0.0-beta-3-linux-x86_64.zip -o protoc-3.0.0-beta-3-linux-x86_64.zip
+unzip protoc-3.0.0-beta-3-linux-x86_64.zip
+sudo mv protoc /usr/bin/protoc
+
+echo "protoc installed success."