Hotfix/#353-wds-code-standards

[gregrickaby]

Closes #353

DESCRIPTION

• Instead of using the PHPCS, ESLint, and Sass-Lint config files included with wd_s, this new TravisCI config uses our new WDS Code Standards (that we're using locally at WebDevStudios) via Composer.
• This will require us to remove the @require from our DocBlocks (Yay! 👏) before TravisCI will pass this and future PRs. (TRAVIS WILL FAIL THIS PR - BUT THAT JUST CONFIRMS THIS NEW CONFIG WORKS!! 😄) See here: https://travis-ci.org/WebDevStudios/wd_s/builds/357604425
• Also adds PHP v7.2 support
• Finally, this is a precursor to an upcoming ticket to remove all the linting config files from this repo, and instead ask that others just use Composer to manage the linting, as seen here: https://github.com/WebDevStudios/WDS-Coding-Standards/wiki/Installation

SCREENSHOTS

• None

DOCUMENTATION

• Yes, I need to write some on how to lint with wd_s

[aubreypwd]

Looks good to me!