udpate Amber to latest master
update start.[sh|bat] to work with latest Amber (as suggested by @philippeback)

fixes #14
enhance README with a 'Getting Started' section
processing: add link to Amber website
add basic index.html file as an entry point for the webbrowser examples
Merge pull request #15 from mkroehnert/update

Update vendor/amber and start.sh, enhance README, add index.html