Add tox for multi-python testing, fix python3 bug

Author: bigbes

.gitignore

@@ -8,3 +8,4 @@
 *.snap
 sophia
 *.egg-info
+.tox

tests/suites/test_dml.py

@@ -236,7 +236,7 @@ def test_10_space(self):
     def test_11_select_all_hash(self):
         space = self.con.space('space_2')
         cnt = 10
-        for k in xrange(cnt):
+        for k in range(cnt):
             space.insert([k, 'lol'])
         self.assertEqual(len(space.select(())), cnt)
         self.assertEqual(len(space.select([])), cnt)

tox.ini

@@ -0,0 +1,14 @@
+# Tox (http://tox.testrun.org/) is a tool for running tests
+# in multiple virtualenvs. This configuration file will run the
+# test suite on all supported python versions. To use it, "pip install tox"
+# and then run "tox" from this directory.
+
+[tox]
+envlist = py27, py35, pypy
+
+[testenv]
+commands = python setup.py test
+deps =
+    pyyaml>=3.10
+    msgpack-python>=0.4.0
+    six