Adds Grunt to style guides

#### What's the plan?
Add Grunt to style guides since Bower from other PR wasn't working.

#### What's this PR do?
Adds in Grunt, festival Sass, TribTalk Sass, and Gemfile. Not sure why the commit from 7/29 is being included in this PR, but that h2 should be part of site footer typography section for TribTalk, so just leaving it.

#### How should this be manually tested?
Run 'npm install' and 'gem install.' Then run 'grunt sass' to check that Sass is compiling to CSS without errors.