update README.md
fix grunt-banner link
add boilerplate config to available-tasks.js
add boilerplate config to banner.js
update README.md
remove browserstack-tunnel.js, see issue #55
rm class-id-minifier.js
rm class-id-minifier task
add class-id-minifier task to performance resources list
move clean task into build tasks
add boilderplate config to clean.js