Remove bower dependency.

[sunglim]

We're using bowser to install bootstrap. but we can use npm instead.

Details : http://getbootstrap.com/getting-started/#download-composer

[codewithtyler]

You mentioned installing via npm but linked to the composer instructions. I think you meant to link to the NPM instructions here: http://getbootstrap.com/getting-started/#download-npm

[sunglim]

@RandomlyKnighted Oops. you're right. thanks for correct link.