chore(build): updates 3rd-party build dependencies

[abacaphiliac]

hi @lloyd , this is an extension of #10

• replaces 3rd-party build dependencies with updated entries in npm devDependencies
• updates Makefile to reference new location of devDependencies in the project's node_modules directory
• ignores generated package-lock.json file and node_modules directory
• extracts .jshintrc from deleted jshint-check.js
• adds incredibly basic CONTRIBUTING.md to document installation of deps and running make to build/minify and execute tests

if you're on board with this kind of change, i'll follow up with proposals to do the same with jquery for browser tests, and get a travis CI build running on this thing. please let me know what you think!