Added new features from August API Changelog#19

Merged

irazasyed merged 2 commits intoirazasyed:masterfrom jonnywilliamson:master

Aug 20, 2015

+41-5

Commits on Aug 19, 2015

Add new method sendVoice for sending voice messages as opposed to audio messages.
jonnywilliamson
committed
Added optional fields performer, title to the Audio object and sendAudio method.
jonnywilliamson
committed