Fix process exit without callback

tasks/install.js

@@ -421,12 +421,13 @@ installer = function (callback) {
 
   });
 
-  task('clean up install', function() {
+  task('clean up install', function(callback) {
 
     // Completion Message
     if(installFolder && !install.shouldAutoInstall()) {
       console.log('\n Setup Complete! \n Installing Peer Dependencies. \x1b[0;31mPlease refrain from ctrl + c\x1b[0m... \n After completion navigate to \x1b[92m' + answers.semanticRoot + '\x1b[0m and run "\x1b[92mgulp build\x1b[0m" to build');
-      process.exit(0);
+      callback();
+      return;
     }
     else {
       console.log('');