$ npm install
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Why use a task runner?
In one word: automation. The less work you have to do when performing repetitive tasks like minification, compilation, unit testing, linting, etc, the easier your job becomes. After you've configured it through a Gruntfile, a task runner can do most of that mundane work for you—and your team—with basically zero effort.
https://gruntjs.com/getting-started
Web sites are made of lots of things — frameworks, libraries, assets, and utilities. Bower manages all these things for you.