Enhance NLP to correct common spelling errors

[danielreed]

We already have a spelling errors correction map in nlp-middleware, we simply need to enhance this to the point that we feel the majority of fat fingered entries will be caught.

Alternatively we could use a javascript hunspell port and use a dictionary. This was prototyped early using a large dictionary, the library had poor performance. We simply have to be able to process text at line speed, this may mean a smaller dictionary, or a customized dictionary with terms that are pertinent to our domain.

Either way here is a start (http://wordlist.aspell.net/)

const spellingErrors = {
  "utilizaton":"utilization",
  "uzing":"using"
}