Add a test script and a YML file for travis-CI

.gitignore

@@ -5,3 +5,4 @@
 /README.txt
 *.pyc
 *.pyo
+/examples/expr.py

.travis.yml

@@ -0,0 +1,6 @@
+language: python
+python:
+  - "2.7"
+  - "3.3"
+  - "3.4"
+script: sh test.sh

test.sh

@@ -0,0 +1,16 @@
+#!/bin/sh
+
+set -e
+trap 'echo ERROR' 0 
+
+export PYTHONPATH=$(pwd)
+for PY_G in python python3 ; do
+$PY_G ./yapps2 examples/expr.g examples/expr.py
+
+for PY_X in python python3 ; do
+test "$(echo "1+2*3+4" | $PY_X examples/expr.py goal)" = 11
+done
+
+done
+
+trap 'rm examples/expr.py; echo OK' 0