Really pick the last version on Pypi for new version checking.

We were only sorting version string lexicographically and it would have break when
we reach version 0.10.N or 0.N.10

CHANGELOG.rst

@@ -13,6 +13,12 @@ Added
 -----
 * Add autofocus to the username input on the login page
 
+Fixed
+-----
+* Really pick the last version on Pypi for new version checking.
+  We were only sorting version string lexicographically and it would have break when
+  we reach version 0.10.N or 0.N.10
+
 
 v0.7.2 - 2016-08-31
 ===================

cas_server/utils.py

@@ -653,7 +653,8 @@ def check_password(method, password, hashed_password, charset):
 
 def decode_version(version):
     """
-        decode a version string following version semantic http://semver.org/ input a tuple of int
+        decode a version string following version semantic http://semver.org/ input a tuple of int.
+        It will work as long as we do not use pre release versions.
 
         :param unicode version: A dotted version
         :return: A tuple a int
@@ -683,9 +684,7 @@ def last_version():
         try:
             req = requests.get(settings.CAS_NEW_VERSION_JSON_URL)
             data = json.loads(req.text)
-            versions = list(data["releases"].keys())
-            versions.sort()
-            version = versions[-1]
+            version = data["info"]["version"]
             last_version._cache = (time.time(), version, True)
             return version
         except (