Add dateutil requirement

Signed-off-by: Michal Čihař <michal@cihar.com>

docs/admin/install.rst

@@ -28,6 +28,8 @@ lxml (>= 3.1.0)
     http://lxml.de/
 South (>= 1.0)
     http://south.aeracode.org/
+dateutil
+    http://labix.org/python-dateutil
 libravatar (optional for federated avatar support)
     https://pypi.python.org/pypi/pyLibravatar
 PyICU (optional for proper sorting of strings)

requirements.txt

@@ -5,4 +5,5 @@ Whoosh>=2.5.2
 Translate-Toolkit>=1.10.0
 lxml>=3.1.0
 Pillow
+dateutil
 python-social-auth>=0.1.17,<0.1.24

weblate/requirements.py

@@ -199,6 +199,16 @@ def get_versions():
         '1.1.6',
     ))
 
+    name = 'dateutil'
+    url = 'http://labix.org/python-dateutil'
+    mod = get_version_module('dateutil', name, url)
+    result.append((
+        name,
+        url,
+        mod.__version__,
+        '1.0'
+    ))
+
     name = 'lxml'
     url = 'http://lxml.de/'
     mod = get_version_module('lxml.etree', name, url)