Update README.md
Added links and info for old portable versions of Chrome
Fixed link for chrome://flags
Removed libraries documentation on deploy
Added info for native support
Merge branch 'master' into Chromium_v28
Updated datachannel polyfill and added reliable library
Added readme for external libraries
Using EventTargets
Updated EventTarget
Using reliable polyfill on native DataChannels
Merge branch 'Chromium_v28' into Chromium_v26