Merge pull request #239 from msabramo/tox_posargs

tox.ini: Use {posargs} so that test runner arguments can be passed to tox

diff --cc tox.ini
index 1209f052ae111c5575e85434990f237060bd7cf5,a8f951eb138342d31feb3c7a8673f66a6ae35d1f..8dc90020e44592c02cf40f378aa11af39667e2c5
--- 1/tox.ini
--- 2/tox.ini
+++ b/tox.ini
@@@ -1,5 -1,5 +1,5 @@@
  [tox]
 -envlist = py26, py27, pypy, py33
 +envlist = py26, py27, pypy, py33, py34
  
  [testenv]
- commands = python run-tests.py
+ commands = python run-tests.py {posargs}