add Webpack support

[mateop]

At the moment this lib doesn't work with webpack, most likely because your gruntfile is set as the main file in package.json

Also you have a typo for the npm installation

[mrsteele]

Thanks @mateop, I appreciate the bug report.

Any chance you (or someone else) could take a stab at this?

• Type in npm install
• Support webpack

[mateop]

I may take a look over the weekend