Update README.md

Remove unncessary ; that caused jslint fails

Adding --no-track to the adding a feature checkout

Removing indentation from example code

Fixing HTML

Adding some explanatory text and updating copyright year

Adding information on cloning repo and getting submodules set up

Adding the semicolon to before the closure

iOs is more correctly spelled as iOS

Making sure that sounds are properly checked for so if they're not there, an error is raised on the console

Moving the error handling into a function rather than exposing it as a property on Wedge. Also, making sure console is available before writing to it

Moving example page to better URL

Making link to example more specific

Removing relative link

Relative links on Github don't really work; not without tying us into Github, anyway