removed TelephonyAudioControls, see issue#5 (https://github.com/sysapps/telephony/issues/5 )
fixed typo, see issue#6 (https://github.com/sysapps/telephony/issues/6 )
fixed typo in sendTones, see issue#8 (https://github.com/sysapps/telephony/issues/8 )
renamed CallHandler::isConference to conference, see issue#10 (https://github.com/sysapps/telephony/issues/10 )