Get initial server generation from first get_updates result

Embedding this in index.html won't work anymore, because the Django FastCGI and
the Tornado servers might have been started at different times.

(imported from commit 187909d0593449cf2989857671f9ca526723e451)

templates/zephyr/index.html

@@ -41,7 +41,6 @@
 
 {# Not escaped, because it's guaranteed by the model to be an integer. #}
 var initial_pointer = {{ user_profile.pointer }};
-var server_generation = {{ server_generation }};
 
 var email = "{{ user_profile.user.email|escapejs }}";
 var have_initial_messages = {{ have_initial_messages|escapejs }};

tools/jslint/check-all.js

@@ -7,7 +7,6 @@ var globals =
 
     // index.html
     + ' initial_pointer email stream_list people_list have_initial_messages'
-    + ' server_generation'
 
     // compose.js
     + ' show_compose hide_compose toggle_compose clear_compose_box compose_button'

zephyr/static/js/zephyr.js

@@ -72,9 +72,6 @@ $(function () {
     });
 });
 
-
-$(function () { get_updates_params.server_generation = server_generation; });
-
 // The "message groups", i.e. blocks of messages collapsed by recipient.
 // Each message table has a list of lists.
 var message_groups = {
@@ -609,7 +606,9 @@ function get_updates() {
             get_updates_params.failures = 0;
             $('#connection-error').hide();
 
-            if (data.server_generation !== get_updates_params.server_generation) {
+            if (get_updates_params.server_generation === -1) {
+                get_updates_params.server_generation = data.server_generation;
+            } else if (data.server_generation !== get_updates_params.server_generation) {
                 get_updates_params.reload_pending = true;
                 reload_app();
             }

zephyr/views.py

@@ -192,8 +192,7 @@ def home(request):
                                'have_initial_messages':
                                    'true' if num_messages > 0 else 'false',
                                'show_debug':
-                                   settings.DEBUG and ('show_debug' in request.GET),
-                               'server_generation': SERVER_GENERATION},
+                                   settings.DEBUG and ('show_debug' in request.GET) },
                               context_instance=RequestContext(request))
 
 @login_required_json_view