tox.ini: Add {posargs} to py.test command

so that user can call tox with options and pass them to py.test -- e.g.:

    tox -e py26,py27,py33 -- -v --tb=short --showlocals -k test_map

1 files changed, 1 insertions, 1 deletions

diff --git a/tox.ini b/tox.ini
index 6dd6c05..10cb06d 100644
--- a/tox.ini
+++ b/tox.ini
@@ -6,7 +6,7 @@ indexserver=
 
 [testenv]
 deps=pytest
-commands= py.test -rfsxX
+commands= py.test -rfsxX {posargs}
 
 [pytest]
 minversion=2.2.0