Add support for check for the latest released version of Mayan.

Signed-off-by: Roberto Rosario <roberto.rosario.gonzalez@gmail.com>

mayan/apps/common/utils.py

@@ -5,17 +5,32 @@ import os
 import shutil
 import tempfile
 import types
+import xmlrpclib
 
 from django.conf import settings
 from django.utils.datastructures import MultiValueDict
 from django.utils.http import urlquote as django_urlquote
 from django.utils.http import urlencode as django_urlencode
 
+import mayan
+
+from .exceptions import NotLatestVersion
+from .literals import MAYAN_PYPI_NAME, PYPI_URL
 from .settings import setting_temporary_directory
 
 logger = logging.getLogger(__name__)
 
 
+def check_version():
+    pypi = xmlrpclib.ServerProxy(PYPI_URL)
+    versions = pypi.package_releases(MAYAN_PYPI_NAME)
+
+    if versions[0] != mayan.__version__:
+        raise NotLatestVersion(upstream_version=versions[0])
+    else:
+        return True
+
+
 # http://stackoverflow.com/questions/123198/how-do-i-copy-a-file-in-python
 def copyfile(source, destination, buffer_size=1024 * 1024):
     """