add some code for generating key pairs using node crypto module
sample invocation: node controllers/keygen.js
proof of concept for creating key pair and signing zip file using keytool and jarsigner and child_process.spawn
Merge pull request #6 from wfwalker/add-keygen.js

generating key pairs using node crypto module
Merge pull request #11 from ozten/master

Add Version to the data model
Sketching out app upload backend