cleaning up
refining sdp modification
renaming findCodecPayloadType to getCodecPayloadType
Merge remote-tracking branch 'upstream/master'

Conflicts:
	samples/web/content/apprtc/apprtc.py
	samples/web/content/apprtc/index.html
	samples/web/content/apprtc/js/main.js
merging changes into sdputils.js signaling.js
style reformat
found a bug
adding removeCodecParam to global
defaulting opusfec to undefined
separating param from its value
separating param from value in add/removeCodecParam
using addCodecParam() in maybeSetVideoSendInitialBitRate()
Merge remote-tracking branch 'upstream/master'
modifying codec parameters by parsing them into key:value pairs
improving code style
put 'header' and 'params' as separate fields
to pass style checker
some renaming per Justin's comments
Relanding Make local-audio demo capable of choosing codec
Moved everything into main.js