Check for missing node modules on startup and provide nice error message

When you forgot to do an npm install after doing a git pull you might get error messages like this for missing dependencies:

#!

   AtlasBoard server started. Go to: http://localhost:3000 to access your dashboard 
   info  - socket.io started
        module.js:340
    throw err;
    ^
        Error: Cannot find module 'cron'
    at Function.Module._resolveFilename (module.js:338:15)
    at Function.Module._load (module.js:280:25)
    at Module.require (module.js:364:17)
    at require (module.js:380:17)
    at Object.<anonymous> (/Users/aro/src/atlassian/confluence-wallboard/packages/dave/jobs/fitness/fitness.js:1:77)
    at Module._compile (module.js:456:26)
    at Object.Module._extensions..js (module.js:474:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:312:12)
    at Module.require (module.js:364:17)

We should check for missing deps ourselves and just terminate with a proper error message of if possible just do the npm install ourselves.

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