Run tests in small scripts

This is so we get a proper shell where running set -xe makes sense allowing travis to pick up nicely on how the tests run (ie. marking them as failed and not errored when the fail).

travis/python.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+
+set -xe
+
+[[ "$PYTHON" == false ]] && exit 0
+
+pushd python_apps/airtime_analyzer 
+nosetests -a '!rgain'
+echo "replaygain tests where skipped due to not having a reliable replaygain install on travis."
+popd