[DOC] `bower install` is part of `npm install`, removing it from README

Updates the readme to only say `npm install`, since `bower install` is part of npm install.

Adds the URL to visit to view tests in the browser.

Changes `grunt-cli` to an npm peerDependency (this removes the warning ">> Local Npm module "grunt-cli" not found. Is it installed?" that one sees when running `grunt dev`)