Add Makefile and update tests

Makefile

@@ -0,0 +1,8 @@
+test:
+	py.test 
+
+coverage:
+	py.test --cov=frank test
+
+.PHONY: test
+

test/test_frank.py

@@ -137,6 +137,9 @@ def test_run_action_shell_with_kwargs():
                  results[0].errors()
 
 def test_run_python_code():
+    import sys
+    import os
+    sys.path.insert(0, os.path.dirname(__file__))
     od = ordered_load("""
     run_function_python:
       python: