Updates to Webpack

Reconfigures ddm-collapsible to compile all the assets used by
collapsibles into a single JavaScript file. This includes the necessary
CSS. It also allows us to distribute the file in UMD format.

Changes build process from gulp to webpack where possible.

Moves gulp tasks into their own individual files.
NPM Publish Prep and Review Fixes

Updates package.json to prepare for publishing to NPM.

Updates webpack.config.js file to always minimize and improves the
layout of the scss loaders.

Moves Transitions.jsx out to a bower dependency and updates webpack
to work with Bower.
Merge pull request #6 from deseretdigital-ui/webpack

Updates to Webpack