Revert liftoff changes due to gruntjs/grunt#1725 (#143)

bin/grunt

@@ -4,7 +4,7 @@
 
 process.title = 'grunt';
 
-var Liftup = require('liftup');
+var Liftoff = require('liftoff');
 var v8flags = require('v8flags');
 var extensions = require('interpret').jsVariants;
 var nopt = require('nopt');
@@ -35,37 +35,35 @@ if ('completion' in options) {
 }
 
 v8flags(function (err, v8flags) {
-  var Grunt = new Liftup({
+  var Grunt = new Liftoff({
     name: 'grunt',
     configName: 'Gruntfile',
     // Support a number of languages based on file extension
     extensions: extensions,
     // Flags that are v8 flags will be loaded into node instead of Gruntfile
     v8flags: v8flags
   });
-  Grunt.prepare({
+  Grunt.launch({
     cwd: options.base,
     configPath: options.gruntfile,
     require: options.require,
     verbose: options.verbose
   }, function (env) {
-    Grunt.execute(env, function(env) {
-      var tasks = options.argv.remain;
-      delete options.argv;
-      // No grunt install found!
-      if (!env.modulePath) {
-        if (options.version) {
-          process.exit();
-        }
-        if (options.help) {
-          info.help();
-        }
-        info.fatal('Unable to find local grunt.', 99);
-      } else {
-        options.gruntfile = env.configPath;
-        var grunt = require(env.modulePath);
-        grunt.tasks(tasks, options);
+    var tasks = options.argv.remain;
+    delete options.argv;
+    // No grunt install found!
+    if (!env.modulePath) {
+      if (options.version) {
+        process.exit();
       }
-    });
+      if (options.help) {
+        info.help();
+      }
+      info.fatal('Unable to find local grunt.', 99);
+    } else {
+      options.gruntfile = env.configPath;
+      var grunt = require(env.modulePath);
+      grunt.tasks(tasks, options);
+    }
   });
 });

package.json

@@ -17,7 +17,7 @@
   "dependencies": {
     "grunt-known-options": "~1.1.1",
     "interpret": "~1.1.0",
-    "liftup": "~3.0.1",
+    "liftoff": "~2.5.0",
     "nopt": "~4.0.1",
     "v8flags": "~3.2.0"
   },