Extended gulp to use in development

- Modularized tasks based on https://github.com/greypants/gulp-starter
- JS effects/interactions are all implemented as Common JS style modules
- gulp-ruby-sass is slow, so use `compass --watch` for "static" design

Need to work on:

- Refactor all custom logging events/statements into a util/logger.js
- Task to tally page weight of production files is mis-timed
- Replace Compass CSS3 mixins with autoprefixer