Add option to disable live reload

Fixes #344 (and hopefully silences a lot of support requests)

config/user.json

@@ -75,8 +75,10 @@
   //set this to enable autosave every X minutes
   "autosaveInterval": 0,
   "autosaveOnBlur": false,
+  //If the editor jumps to the top on focus change, set this:
+  "disableReload": false,
 
-  //Crazy? You might like Vim keybindings.
+  //Wildly eccentric? You might like Vim keybindings.
   "emulateVim": false,
 
   //Whether to show the "New file" tab button on the tab bar;

js/fileManager.js

@@ -92,6 +92,7 @@ define([
   };
 
   command.on("session:check-file", function() {
+    if (Settings.get("user").disableReload) return;
     var tab = sessions.getCurrent();
     if (!tab.file || tab.file.virtual) return;
     tab.file.entry.file(function(entry) {