title: LUIS inserts whitespace in utterances when punctuation present causing entity getting incorrectly parsed
body: <p>I am playing around with the Luis stock ticker example here, <a href="https://github.com/Microsoft/BotBuilder/blob/master/CSharp/Samples/Stock_Bot/Luis_Model/Stock%20Model.json" rel="nofollow">GitHub MicrosoftBotBuilder Example</a>, it works well and the entity in the utterances is identified but there are stock tickers in the world that have periods in them such as <strong>bt.a</strong></p>
  
  <p>Luis by default pre-processes utterances where word breaks are inserted around punctuation characters and therefore an utterance of "<strong>what is price of bt.a</strong>" becomes "<strong>what is price of bt. a</strong>" and therefore Luis thinks the entity is "<strong>bt</strong>" instead of "<strong>bt.a</strong>"</p>
  
  <p>Does anyone know how to get around this? Thx</p>