Revert "[third] Upgrade jquery to version 1.8.3."

This reverts commit be93b6ea28.

Unfortunately, the newer jquery comes with a huge performance
regression affecting the hotkeys code, which has the effect of making
typing super slow.

Fixes: #1449.

frontend_tests/node_tests/i18n.js

@@ -23,7 +23,7 @@ i18n.init({
     }
 });
 
-global.$ = require('jquery');
+global.$ = require('jQuery');
 var _ = global._;
 
 // When writing these tests, the following command might be helpful:

frontend_tests/node_tests/message_list_view.js

@@ -2,7 +2,7 @@ var _ = require('third/underscore/underscore.js');
 var MessageListView = require('js/message_list_view.js');
 
 add_dependencies({
-    $: 'jquery',
+    $: 'jQuery',
     XDate: 'third/xdate/xdate.dev.js',
     util: 'js/util.js'
 });

frontend_tests/node_tests/presence_list_performance.js

@@ -25,7 +25,7 @@ compose_fade.update_faded_users = function () {
    return;
 };
 
-global.$ = require('jquery');
+global.$ = require('jQuery');
 $.fn.expectOne = function () {
     assert(this.length === 1);
     return this;

frontend_tests/node_tests/stream_list.js

@@ -20,7 +20,7 @@ set_global('message_store', {
 
 var stream_list = require('js/stream_list.js');
 
-global.$ = require('jquery');
+global.$ = require('jQuery');
 $.fn.expectOne = function () {
     assert(this.length === 1);
     return this;

frontend_tests/node_tests/templates.js

@@ -15,7 +15,7 @@ i18n.init({
     lng: 'en'
 });
 
-global.$ = require('jquery');
+global.$ = require('jQuery');
 var _ = global._;
 
 // When writing these tests, the following command might be helpful:

package.json

@@ -8,7 +8,7 @@
   "devDependencies": {
     "handlebars": "1.3.0",
     "istanbul": "0.4.0",
-    "jquery": "1.8.3",
+    "jQuery": "1.7.4",
     "jsdom": "0.5.7",
     "xmlhttprequest": "1.5.0",
     "nwmatcher": "1.3.6",

zproject/settings.py

@@ -642,7 +642,7 @@ PIPELINE = {
 JS_SPECS = {
     'common': {
         'source_filenames': (
-            'third/jquery/jquery-1.8.3.js',
+            'third/jquery/jquery-1.7.2.js',
             'third/underscore/underscore.js',
             'js/blueslip.js',
             'third/bootstrap/js/bootstrap.js',