cleaning up
refining sdp modification
renaming findCodecPayloadType to getCodecPayloadType
Added codec selection as a new page.
Instead modifying original page.
Merge branch 'codec_selection_page'
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
Addressed comments.
separating param from its value
separating param from value in add/removeCodecParam
using addCodecParam() in maybeSetVideoSendInitialBitRate()
Moving sdp codec utils to top-level, symlinking.
Added downloaded app engine sdk to gitignore.
Made audio use the new sdp code.
Merge remote-tracking branch 'upstream/master'