default arch when building

Updated to default to the correct architecture when building the
application. Allows for architecture to be overridden.

lib/build.js

@@ -5,8 +5,7 @@ const Util = require('util');
 
 const defaults = {
   server: 'localhost',
-  directory: '.demeteorized',
-  architecture: 'os.linux.x86_64'
+  directory: '.demeteorized'
 };
 
 //
@@ -17,13 +16,18 @@ const defaults = {
 //
 module.exports = function (options, done) {
   options = Hoek.applyToDefaults(defaults, options);
-
-  var build = ChildProcess.spawn('meteor', [
+  var args = [
     'build',
     '--server', options.server,
-    '--directory', Util.format('%s', options.directory),
-    '--architecture', options.architecture
-  ], { cwd: options.input, stdio: 'inherit' });
+    '--directory', Util.format('%s', options.directory)
+  ];
+
+  if (options.architecture) {
+    args.push('architecture');
+    args.push(options.architecture);
+  }
+
+  var build = ChildProcess.spawn('meteor', args, { cwd: options.input, stdio: 'inherit' });
 
   build.on('error', function (err) {
     done(err);

test/build.js

@@ -34,13 +34,29 @@ describe('build', function () {
 
   it('defaults options', function (done) {
     Build({}, function () {
+      expect(cpStub.spawn.calledWith('meteor', [
+        'build',
+        '--server',
+        'localhost',
+        '--directory',
+        '.demeteorized'
+      ])).to.be.true();
+
+      done();
+    });
+
+    emitter.emit('close', 0);
+  });
+
+  it('overrides architecture when provided', function (done) {
+    Build({ architecture: 'os.linux.x86_64' }, function () {
       expect(cpStub.spawn.calledWith('meteor', [
         'build',
         '--server',
         'localhost',
         '--directory',
         '.demeteorized',
-        '--architecture',
+        'architecture',
         'os.linux.x86_64'
       ])).to.be.true();