loginManager: fix versionCompare function

It's important to compare the version components as integers,
not strings, so "10" evaulates as greater than "5"

This fixes the login screen in gnome 3.10.

https://bugzilla.gnome.org/show_bug.cgi?id=708691

js/misc/loginManager.js

@@ -72,8 +72,10 @@ function versionCompare(required, reference) {
     reference = reference.split('.');
 
     for (let i = 0; i < required.length; i++) {
-        if (required[i] != reference[i])
-            return required[i] < reference[i];
+        let requiredInt = parseInt(required[i]);
+        let referenceInt = parseInt(reference[i]);
+        if (requiredInt != referenceInt)
+            return requiredInt < referenceInt;
     }
 
     return true;