chore(power-assert): update dependencies
chore(power-assert): update examples
chore(power-assert): update dependencies
chore(power-assert): update browserify
chore(power-assert): replace obsoleted gulp-clean with del
chore(power-assert): replace obsoleted gulp-connect with gulp-webserver
chore(power-assert): does not require es5-shim even if using phantomjs
feat(power-assert): use single index.js

Say farewell to UMD and hello to browserify.