Added webrtc manual test pages + fixed misc

* Copied all the manual test pages from the webrtc/test/manual [folder](https://code.google.com/p/webrtc/source/browse/?r=7738#svn%2Ftrunk%2Fwebrtc%2Ftest%2Fmanual) in the WebRTC repo (svn r7738).
* Renamed them according to googlechrome/WebRTC naming (e.g. testpagename/index.html).
* Renamed two-video-devices-html to multiple-video-devices due to fixing and improving the test to use more cameras.
* Fixed the multiple-video-devices test so that it can use an arbitrary number of cameras using getSources.
* Moved JS code out of HTML file if longer than 30 lines or so to js/main.js (multiple-video-devices & multiple-peerconnections)
* Added 'use strict' to the aforementioned pages where JS code was separated from HTML.
* Updated copyright.
* Updated path to use the global adapter.js.
* Fixed iframe paths for iframe test pages
* Fixed iframe height (% does not work on height it seems, used "px" instead).