Various fixes and changes for SQLAlchemy support:

- added a thin python wrapper around mariadb module
- added constansts under mariadb.constants (CLIENT, CURSOR, INDICATOR)
- bench and test are now in testing subdirectory
- updated documentation

testing/bench_mariadb.py

@@ -0,0 +1,25 @@
+#!/usr/bin/env python3 -O
+# -*- coding: utf-8 -*-
+
+# requirement: pip install pyperf
+
+import importlib 
+
+from benchmarks.internal_bench import test_suite
+from benchmarks.internal_bench import run_test
+from test.conf_test import conf
+
+import os
+
+module= os.environ.get('TEST_MODULE', 'mariadb'),
+dbdrv = importlib.import_module(module[0])
+
+
+def main():
+    default_conf = conf()
+    conn = dbdrv.connect(**default_conf)
+    run_test(test_suite(), conn)
+    conn.close()
+
+if __name__ == "__main__":
+    main()