added event triggered for answered. 
added call times to event message of both answered and hangup
added answered event for VoiceServlet. added an info object to EventPost
to send useful info like startTime, releaseTime needed for capturing
call duration
removed call to delete stringStore entity having the questionMap
updated all text servlets to adhere to senderId precedence: nickname >
senderName > myAddress
added subject to the /rpc param, used to add a subject to an email
updated changeLog