Add tox configuration

.gitignore

@@ -3,3 +3,6 @@
 __pycache__/
 *.pyc
 /Flask_Logging_Extras.egg-info/
+/.tox/
+.coverage
+/htmlcov/

tox.ini

@@ -0,0 +1,8 @@
+[tox]
+envlist = py27, py33, py34, py35, py36
+
+[testenv]
+commands =
+  coverage run --source flask_logging_extras/ -m unittest discover --start-directory tests
+  coverage report -m
+deps = coverage