This class directly reflects the Say verb documented at
http://www.twilio.com/docs/api/twiml/say
All of the descriptions included in these javadoc comments
come directly from the twilio website.
Say(String) - Constructor for class com.twilio4j.twiml.Say
The 'Say' verb converts text to speech that is read back to the caller.
Twilio will pass the following parameters in addition to the standard TwiML Voice request parameters with its request
to the 'statusCallback' URL of Sms.