Move peerconnection.html (renamed) to webrtc github repo

The files are from a chromium checkout with commit: 406524c9684aec97509dfae881b8aa45273d0823 being latest (Tue Aug 26 01:33:08 2014 -0700).

Files reside in http://src.chromium.org/chrome/trunk/src/chrome/test/data/webrtc/manual/ and are renamed as following:
peerconnection.html > index.html
peerconnection.js> main.js
peerconnection-iframe.html > index-iframe.html
peerconnection-multi-pc.html > index-multi-pc.html
peerconnection-help.html > index-help.html
constraints.html > index-constraints.html (not sure if this is the right place for it)

Not renamed:
constraints.js  (not renamed yet as I do not know if it should reside here)
stylesheet.css

Not entirely sure of an appropriate name for index.html (former peerconnection.html) (I named the folder manual-test) as it does so much. 
It's currently the go to manual test page for the WebRTC api in Chrome. 
It does peerconnection(pc from now on), pc offer/answer constraints, gUM, gUM constraints, getSourcers, DTMF, data channel RTP/SCTP, screencapture and more. 

Also present in the same folder are: 
- "index-iframe.html" which is index.html in an iframe.
- "index-constraints.html" page (JS in constraints.js) that exercises gUM constraints (similar to the one on gitHUB but can do both mandatory and optional)
- "constraints.js" belongs to index-constraints.html.
- "index-multi-pc.html" that does multiple peerconnections on the same page.
- "stylesheet.css" most of the pages rely on this for the layout.
- "main.js" JS for index.html

All files that use adapter.js have been updated to use the samples/web/js/adapter.js.