Added initial Gruntfile.js

Added a gruntfile to compile into dist/ and uses a credentials file (.credentials.json)

Gruntfile.js

@@ -0,0 +1,24 @@
+module.exports = function(grunt) {
+    var config = require('./.credentials.json');
+    var branch = grunt.option('branch') || config.branch;
+    var email = grunt.option('email') || config.email;
+    var token = grunt.option('token') || config.token;
+    var ptr = grunt.option('ptr') ? true : config.ptr;
+    
+
+    grunt.loadNpmTasks('grunt-screeps');
+
+    grunt.initConfig({
+        screeps: {
+            options: {
+                email: email,
+                token: token,
+                branch: branch,
+                ptr: ptr
+            },
+            dist: {
+                src: ['dist/*.js']
+            }
+        }
+    });
+}