pin down missing packages in versions.cfg

versions.cfg

 [versions]
+Babel = 1.3
 Flask = 0.10.1
 Flask-Babel = 0.9
 Jinja2 = 2.7.2
 flake8 = 2.1.0
 itsdangerous = 0.23
 mccabe = 0.2.1
+mock = 1.0.1
 pep8 = 1.4.6
 plone.testing = 4.0.8
 pyflakes = 0.7.3
+pytz = 2013b
 pyyaml = 3.10
 requests = 2.2.0
 robotframework-debuglibrary = 0.3
 robotframework-selenium2library = 1.5.0
 robotsuite = 1.4.2
 selenium = 2.39.0
+speaklater = 1.3
 unittest2 = 0.5.1
 waitress = 0.8.8
 zc.recipe.testrunner = 2.0.0
 
 # Required by:
 # zope.testrunner==4.4.1
-six = 1.5.2
+six = 1.6.1
 
 # Required by:
 # collective.recipe.omelette==0.16
 # Required by:
 # zc.recipe.testrunner==2.0.0
 zope.testrunner = 4.4.1
+
+# Required by:
+# searx==0.3.0
+python-dateutil = 2.2