Add a an API for text-to-speech.

[davidbau]

A request from kids: a way to do text-to-speech, i.e., a way to say 'hello, I am the turtle', and have the turtle speak it out.

[davidbau]

One approach is to use google translate's TTS service:

http://translate.google.com/translate_tts?ie=UTF-8&q=how+is+it+today&tl=en

Unfortunately, they do not serve results when a Referrer header is present, so if we want to use this data, we need to build a proxy into pencilcode.

[weihang7]

http://www.masswerk.at/mespeak/
This may useful.