dont assume the new target function has an identifier, in case its a new variable getting set

[redterror]

I'm not sure this is entirely the right place for this, but it addresses the issue I had whereby doing:

$ shep config set FOO=bar

Would error with:

TypeError: Cannot read property 'Alias' of undefined
    at /home/dave/dev/lambda-alerts/node_modules/shep/lib/util/aws/lambda.js:115:42
    at next (native)
    at tryCatcher (/home/dave/dev/lambda-alerts/node_modules/bluebird/js/release/util.js:16:23)
    at PromiseSpawn._promiseFulfilled (/home/dave/dev/lambda-alerts/node_modules/bluebird/js/release/generators.js:97:49)
    at Async._drainQueue (/home/dave/dev/lambda-alerts/node_modules/bluebird/js/release/async.js:138:12)
    at Async._drainQueues (/home/dave/dev/lambda-alerts/node_modules/bluebird/js/release/async.js:143:10)
    at Immediate.Async.drainQueues (/home/dave/dev/lambda-alerts/node_modules/bluebird/js/release/async.js:17:14)
    at runCallback (timers.js:672:20)
    at tryOnImmediate (timers.js:645:5)
    at processImmediate [as _immediateCallback] (timers.js:617:5)

The bigger question is probably: why is updateFunction getting passed a partially initialized function?