updated readme and .gitignore

Author: simplydallas

.gitignore

@@ -1,2 +1,4 @@
 .DS_Store
 packer_cache
+packer-templates/virtualbox/
+devops-kungfu/

README.md

@@ -13,7 +13,7 @@ Instructions for Intro to DevOps Project
 ### To make an image for local development
 1. run `packer build -only=virtualbox-iso application-server.json`
 2. run `cd virtualbox`
-3. run `vagrant box add ubuntu-14.04.2-server-amd64-appserver_virtualbox.box --name devops-appserver`
+3. run `vagrant box add ubuntu-14.04.4-server-amd64-appserver_virtualbox.box --name devops-appserver`
 4. run `vagrant up`
 5. run `vagrant ssh` to connect to the server
 
@@ -39,3 +39,9 @@ See full directions at: https://www.udacity.com/wiki/ud611
     `sudo npm install`
     Now you can run tests - `grunt -v`
 
+
+### Troubleshooting
+
+* If you encounter errors with Ubuntu version numbers not being available or checksum errors on Ubuntu and this repository is not yet updated, you can fix this by editing the contents of the `application-server.json` and `control-server.json` template files inside the `packer-templates` folder.
+
+* Find the newest version number and checksum from http://releases.ubuntu.com/trusty/ and edit `PACKER_BOX_NAME` and `iso_checksum` in the template files to match.