Don't check for updates if it's a custom build.

Currently we check whether the version has the '.', the custom builds
would have commit hash as version, which doesn't contain '.'.

src/atom-application.coffee

@@ -50,6 +50,10 @@ class AtomApplication
     @buildApplicationMenu()
     @handleEvents()
 
+    # Don't check for updates if it's a custom build.
+    if @version.indexOf('.') isnt -1
+      @checkForUpdates()
+
     if test
       @runSpecs(true)
     else if pathsToOpen.length > 0
@@ -100,6 +104,10 @@ class AtomApplication
   setupJavaScriptArguments: ->
     app.commandLine.appendSwitch 'js-flags', '--harmony_collections'
 
+  checkForUpdates: ->
+    autoUpdater.setAutomaticallyChecksForUpdates true
+    autoUpdater.checkForUpdatesInBackground()
+
   buildApplicationMenu: (version, continueUpdate) ->
     menus = []
     menus.push

src/main.coffee

@@ -45,9 +45,8 @@ setupCrashReporter = ->
 
 setupAutoUpdater = ->
   autoUpdater.setFeedUrl 'https://speakeasy.githubapp.com/apps/27/appcast.xml'
-  autoUpdater.setAutomaticallyChecksForUpdates true
+  autoUpdater.setAutomaticallyChecksForUpdates false
   autoUpdater.setAutomaticallyDownloadsUpdates true
-  autoUpdater.checkForUpdatesInBackground()
 
 parseCommandLine = ->
   version = fs.readFileSync(path.join(__dirname, '..', '..', 'version'), 'utf8')