Added Criterion unit test framework

prepare_env.py

@@ -70,6 +70,7 @@ def main():
         if uncommented.startswith("["):
             dep_name = re.search('\[(.*)\]', uncommented).group(1)
             dep = Dependency(dep_name, f)
+            print("Downloading dependency " + dep_name + "...")
             dep.download()
 
     f.close()