Add Missing Error-Handling

[xjamundx]

Currently when you try to enrouten a file that has some bad JavaScript, you get a pretty measily error message:
[ReferenceError: server is not defined]

With this change you get a message similar to the message one would get with node.js:

ReferenceError: server is not defined
    at Object.<anonymous> (/Users/jamuferguson/dev/paypal/8ballUI/controllers/extendSession.js:26:1)
    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)
    at require (module.js:380:17)
    at /Users/jamuferguson/dev/paypal/8ballUI/node_modules/kraken-js/node_modules/express-enrouten/index.js:85:35
    at Array.forEach (native)
    at Object.withRoutes (/Users/jamuferguson/dev/paypal/8ballUI/node_modules/kraken-js/node_modules/express-enrouten/index.js:83:41)

[xjamundx]

This may or may not be something that you want. If you can point me to where in kraken the error is currently being handled we can probably fix the problem just in that location.