Replace grunt-sed with npm script
Created by: cvrebert
Refs https://github.com/twbs/bootstrap/pull/17446#issuecomment-137989190
Useful reference material: http://blog.keithcirkel.co.uk/how-to-use-npm-as-a-build-tool/
Created by: cvrebert
Refs https://github.com/twbs/bootstrap/pull/17446#issuecomment-137989190
Useful reference material: http://blog.keithcirkel.co.uk/how-to-use-npm-as-a-build-tool/