changed Audio.cpp to not overflow _audioOutput buffer, and 2 other things

added _consecutiveNotMixedCount to prevent premature injector stream
deletion;  made silent-frame drop only occur in dynamic jitter buffer
mode
use compiler default C++ Standard Library on OS X
updates to RtMidi find module to look for static or dynamic lib
Merge branch 'master' of https://github.com/highfidelity/hifi
added dev menu option to disable _audioOutput overflow check
moved qAudioOutput buffer overflow debug option to existing audio menu
Merge pull request #3135 from wangyix/quick_audio_PR

changed Audio.cpp to not overflow _audioOutput buffer; fixed premature injector stream deletion; disabled silent-frame dropping in non-dyanimic-jitter-buffers mode
Merge pull request #3136 from birarda/master

use compiler default C++ standard library on OS X, tweak RtMidi find module
Merge pull request #3137 from PhilipRosedale/master

Better clapping and hand squeezing scripts, started new hair class to hold vertlet hair
Fix script errors not being reported

Script.update event needs to be emitted after reporting any script errors.
Merge pull request #3140 from ctrlaltdavid/script_error_reporting

Fix script errors not being reported
Merge branch 'master' of https://github.com/worklist/hifi
switched to better sounds for clapping