Support building on the Travis continuous integration servers.

.travis.yml

+language: c
+compiler:
+  - gcc
+  - clang
+
+branches:
+  only:
+    - master
+
+before_install:
+  - sudo apt-get update -qq
+
+install:
+  - sudo apt-get install -qq libpulse-dev portaudio19-dev libsonic-dev
+
+script:
+  - ./autogen.sh
+  - ./configure
+  - make

README.md

 # eSpeak NG Text-to-Speech
 
+<a href="https://travis-ci.org/espeak-ng/espeak-ng"><img src="https://secure.travis-ci.org/espeak-ng/espeak-ng.png?branch=master"/></a>
+
 - [Build Dependencies](#build-dependencies)
   - [Debian](#debian)
 - [Building](#building)