Adding some iPad event publishing optimizations. Fixed #1623.

app/Router.coffee

@@ -177,3 +177,7 @@ module.exports = class CocoRouter extends Backbone.Router
       @openView view
     else
       @openView e.view
+
+  navigate: (fragment, options) ->
+    super fragment, options
+    Backbone.Mediator.publish 'router:navigated', route: fragment

app/initialize.coffee

@@ -61,10 +61,12 @@ setUpBackboneMediator = ->
   Backbone.Mediator.addChannelSchemas schemas for channel, schemas of channelSchemas
   Backbone.Mediator.setValidationEnabled document.location.href.search(/codecombat.com/) is -1
   if webkit?.messageHandlers
+    window.iPadSubscriptions = 'application:error': true  # We try to subscribe to this one before it's all set up, so just do it.
     originalPublish = Backbone.Mediator.publish
     Backbone.Mediator.publish = ->
       originalPublish.apply Backbone.Mediator, arguments
-      webkit.messageHandlers.backboneEventHandler?.postMessage channel: arguments[0], event: serializeForIOS(arguments[1] ? {})
+      if window.iPadSubscriptions[arguments[0]]
+        webkit.messageHandlers.backboneEventHandler?.postMessage channel: arguments[0], event: serializeForIOS(arguments[1] ? {})
 
 setUpMoment = ->
   {me} = require 'lib/auth'
@@ -106,6 +108,12 @@ watchForErrors = ->
     noty text: message, layout: 'topCenter', type: 'error', killer: false, timeout: 5000, dismissQueue: true, maxVisible: 3, callback: {onClose: -> --currentErrors}
     Backbone.Mediator.publish 'application:error', message: msg  # For iOS app
 
+window.addIPadSubscription = (channel) ->
+  window.iPadSubscriptions[channel] = true
+
+window.removeIPadSubscription = (channel) ->
+  window.iPadSubscriptions[channel] = false
+
 setUpIOSLogging = ->
   return unless webkit?.messageHandlers
   for level in ['debug', 'log', 'info', 'warn', 'error']

app/locale/en.coffee

@@ -59,6 +59,7 @@
     about: "About"
     contact: "Contact"
     twitter_follow: "Follow"
+    teachers: "Teachers"
     employers: "Employers"
 
   versions:

app/schemas/subscriptions/misc.coffee

@@ -29,6 +29,9 @@ module.exports =
     viewClass: {type: 'function'}
     viewArgs: {type: 'array'}
 
+  'router:navigated': c.object {required: ['route']},
+    route: {type: 'string'}
+
   'achievements:new': c.object {required: ['earnedAchievements']},
     earnedAchievements: {type: 'object'}
 

app/templates/base.jade

@@ -75,7 +75,7 @@ body
           a(title='Contact', tabindex=-1, data-toggle="coco-modal", data-target="modal/ContactModal", data-i18n="nav.contact") Contact
           a(href='http://blog.codecombat.com/', data-i18n="nav.blog") Blog
           a(href='http://discourse.codecombat.com/', data-i18n="nav.forum") Forum
-          a(href='/teachers', data-i18n="nav.forum") Teachers
+          a(href='/teachers', data-i18n="nav.teachers") Teachers
           if me.isAdmin()
             a(href='/admin', data-i18n="nav.admin") Admin
 

config.coffee

@@ -94,6 +94,7 @@ exports.config =
         semicolons: false
     sass:
       mode: 'ruby'
+      allowCache: true
 
   onCompile: (files) ->
     exec = require('child_process').exec