fixed release.js to use uglify 2.4.3

changed the package.json to look in the root, as with the rest of the
file reads. changed the uglify function to use uglify.js 2.4.x's simpler
minify api.
updated package.json to use uglifier-js 2.x

updated package.json to use uglifier-js 2.x
Merge pull request #178 from coh516/uglify.js-2.x-

updated tools/release.js to use uglify-js 2.x