add run_tests.sh script to run tests in all envs

run_tests.sh

@@ -0,0 +1,35 @@
+#!/bin/bash
+
+# This script runs the tests in Python 2.7, Python 3.4, and PyPy
+# a virtualenv for each of these, repectively, should be avaiable at
+# venv, venv3, and venvpypy
+if [[ "$VIRTUAL_ENV" != "" ]]
+then
+    deactivate
+fi
+
+EXITCODE=0
+
+venv/bin/nosetests
+PYYTHON2_EXITCODE=$?
+venv3/bin/nosetests
+PYTHON3_EXITCODE=$?
+venvpypy/bin/nosetests
+PYPY_EXITCODE=$?
+
+if [[ $PYTHON2_EXITCODE != 0 ]]
+then
+    echo 'python 2.7 tests failed'
+    EXITCODE=$PYTHON2_EXITCODE
+fi
+if [[ $PYTHON3_EXITCODE != 0 ]]
+then
+    echo 'python 3.4 tests failed'
+    EXITCODE=$PYTHON3_EXITCODE
+fi
+if [[ $PYPY_EXITCODE != 0 ]]
+then
+    echo 'pypy tests failed'
+    EXITCODE=$PYPY_EXITCODE
+fi
+exit $EXITCODE