Expand the address input intent to handle failing NLP

[curranjm]

One thing that we've seen a lot of is the Alexa platform failing to correctly interpret more difficult street names. For instance, when we tried Everdean St. none of us could make themselves understood to Alexa no matter how clearly we enunciated.

For these situations, it would be nice to support the ability to spell your street name if Alexa is having a hard time.

Something along the lines of:
"Alexa, my street number is ONE SIX ZERO ZERO and my street name is P - E - N - N - S - Y - L - V - A - N - I - A avenue."