new travis.yml; last used file per-platform

doc/.travis.yml

@@ -0,0 +1,9 @@
+# Handle git submodules yourself
+git:
+    submodules: false
+# Use sed to replace the SSH URL with the public URL, then initialize submodules
+before_install:
+    - sed -i 's/git@github.com:/https:\/\/github.com\//' .gitmodules
+    - git submodule update --init --recursive
+language: node_js
+  - "6.5.0"

src/platform/vcs.js

@@ -69,6 +69,7 @@ var VCSPlatform = function() {
   this.pause = function() { Javatari.room.console.pause(); }
   this.resume = function() { Javatari.room.console.go(); }
   this.step = function() { Javatari.room.console.debugSingleStepCPUClock(); }
+  this.stepBack = function() { Javatari.room.console.debugStepBackInstruction(); }
   this.runEval = function(evalfunc) { Javatari.room.console.debugEval(evalfunc); }
 
   this.setupDebug = function(callback) {

src/ui.js

@@ -73,8 +73,8 @@ function getCurrentPresetTitle() {
 }
 
 function setLastPreset(id) {
-  localStorage.setItem("__lastid", id);
   localStorage.setItem("__lastplatform", platform_id);
+  localStorage.setItem("__lastid_"+platform_id, id);
 }
 
 function updatePreset(current_preset_id, text) {
@@ -906,7 +906,8 @@ try {
       updateSelector();
     } else {
       // try to load last file
-      var lastid = localStorage.getItem("__lastid");
+      var lastid = localStorage.getItem("__lastid_"+platform_id) || localStorage.getItem("__lastid");
+      localStorage.removeItem("__lastid");
       gotoPresetNamed(lastid || PRESETS[0].id);
     }
   }