Adds Travis Cl support to test the code automatically.

.travis.yml

@@ -0,0 +1,4 @@
+language: cpp
+script: ./autogen.sh && ./configure && make distcheck
+notifications:
+  email: false

README.md

@@ -1,6 +1,8 @@
 Protocol Buffers - Google's data interchange format
 ===================================================
 
+[![Build Status](https://travis-ci.org/google/protobuf.svg?branch=master)](https://travis-ci.org/google/protobuf)
+
 Copyright 2008 Google Inc.
 
 https://developers.google.com/protocol-buffers/