Arduino library / API for reading the prediction / pipeline results.

[damellis]

i.e. a way to get a call to a function like prediction(label) or result(float[]) instead of having to do the serial parsing manually.

[damellis]

Deferring this for now since the example (https://github.com/damellis/ESP/commit/5da3776db3aabdfa6a88247e99633040ac111fee) is relatively straightforward.