Add deps in tox

tox.ini

@@ -1,7 +1,36 @@
 [tox]
 envlist = py26, py27, py31, py32, py33
 
+[base]
+deps =
+  nose-cov
+  pam
+  requests
+
 [testenv]
-deps = nose-cov
 commands = nosetests []
 
+[testenv:py26]
+deps =
+  python-ldap
+  {[base]deps}
+
+[testenv:py27]
+deps =
+  python-ldap
+  {[base]deps}
+
+[testenv:py31]
+deps =
+  python3-ldap
+  {[base]deps}
+
+[testenv:py32]
+deps =
+  python3-ldap
+  {[base]deps}
+
+[testenv:py33]
+deps =
+  python3-ldap
+  {[base]deps}