Adds raise hand button to the side toolbar

index.html

             <a class="button icon-contactList" id="toolbar_contact_list" data-container="body" data-toggle="popover" data-placement="right" shortcut="contactlistpopover"  data-i18n="[content]bottomtoolbar.contactlist" content="Open / close contact list">
                 <span id="numberOfParticipants"></span>
             </a>
+            <a class="button icon-link" id="toolbar_button_link" data-container="body" data-toggle="popover" data-placement="right" data-i18n="[content]toolbar.invite" content="Invite others"></a>
             <a class="button icon-chat" id="toolbar_button_chat" data-container="body" data-toggle="popover" shortcut="toggleChatPopover" data-placement="right" data-i18n="[content]toolbar.chat" content="Open / close chat">
                 <span id="unreadMessages"></span>
             </a>
             <a class="button icon-telephone" id="toolbar_button_sip" data-container="body" data-toggle="popover" data-placement="right" content="Call SIP number" data-i18n="[content]toolbar.sip" style="display: none"></a>
             <a class="button icon-dialpad" id="toolbar_button_dialpad" data-container="body" data-toggle="popover" data-placement="right" content="Open dialpad" data-i18n="[content]toolbar.dialpad" style="display: none"></a>
             <a class="button icon-settings" id="toolbar_button_settings" data-container="body" data-toggle="popover" data-placement="right" content="Settings" data-i18n="[content]toolbar.Settings"></a>
+            <a class="button icon-raised-hand" id="toolbar_button_raisehand" data-container="body" data-toggle="popover" data-placement="right" data-i18n="[content]toolbar.raiseHand" content="Raise Hand" shortcut="raiseHandPopover"></a>
             <a class="button icon-full-screen" id="toolbar_button_fullScreen" data-container="body" data-toggle="popover" data-placement="right" shortcut="toggleFullscreenPopover" data-i18n="[content]toolbar.fullscreen" content="Enter / Exit Full Screen"></a>
             <a class="button icon-toggle-filmstrip" id="toolbar_film_strip" data-container="body" data-toggle="popover" shortcut="filmstripPopover" data-placement="right" data-i18n="[content]toolbar.filmstrip" content="Show / hide videos"></a>
             <a class="button icon-feedback" id="feedbackButton" data-container="body" data-toggle="popover" data-placement="right" data-i18n="[content]feedback"></a>

interface_config.js

     // the toolbar buttons line is intentionally left in one line, to be able
     // to easily override values or remove them using regex
     MAIN_TOOLBAR_BUTTONS: ['microphone', 'camera', 'desktop', 'invite', 'hangup'], // jshint ignore:line
-    TOOLBAR_BUTTONS: ['profile', 'authentication', 'microphone', 'camera', 'desktop', 'recording', 'security', 'invite', 'chat', 'etherpad', 'sharedvideo', 'fullscreen', 'sip', 'dialpad', 'settings', 'hangup', 'filmstrip', 'contacts'], // jshint ignore:line
+    TOOLBAR_BUTTONS: ['profile', 'authentication', 'microphone', 'camera', 'desktop', 'recording', 'security', 'raisehand', 'chat', 'etherpad', 'sharedvideo', 'fullscreen', 'sip', 'dialpad', 'settings', 'hangup', 'filmstrip', 'contacts'], // jshint ignore:line
     SETTINGS_SECTIONS: ['language', 'devices', 'moderator'],
     // Determines how the video would fit the screen. 'both' would fit the whole
     // screen, 'height' would fit the original video height to the height of the

modules/UI/toolbars/Toolbar.js

         this.toolbarSelector = $("#mainToolbarContainer");
         this.extendedToolbarSelector = $("#extendedToolbar");
 
-        this._initMainToolbarButtons();
-
+        // First hide all disabled buttons in the extended toolbar.
+        // TODO: Make the extended toolbar dynamically created.
         UIUtil.hideDisabledButtons(defaultToolbarButtons);
 
+        // Initialise the main toolbar. The main toolbar will only take into
+        // account it's own configuration from interface_config.
+        this._initMainToolbarButtons();
+
         Object.keys(defaultToolbarButtons).forEach(
             id => {
                 if (UIUtil.isButtonEnabled(id)) {