Build: drop bower; use npm for front-end deps

Fixes #15186
Closes gh-1620

Conflicts:
	bower.json
Build: update front-end dependencies
Build: update node dependencies barring jscs
Build: update grunt-jscs-checker and pass with the new rules

Conflicts:
	build/tasks/build.js
	src/ajax/xhr.js
	src/attributes/classes.js
	src/attributes/prop.js
	src/attributes/val.js
	src/core/init.js
	src/core/ready.js
	src/css.js
	src/css/curCSS.js
	src/css/defaultDisplay.js
	src/data.js
	src/data/var/dataPriv.js
	src/data/var/dataUser.js
	src/dimensions.js
	src/effects.js
	src/event.js
	src/manipulation.js
	src/offset.js
	src/queue.js
	src/selector-native.js
	test/data/testrunner.js