Convert isomorphic web to ES2015

[jstclair]

Highlights (or lowlights, depending on your preferences)

• All code to ES2015
• Replace node-jsx with babel
• Replace jshint with eslint (along with support for React-specific checks via eslint-plugin-react)
• Updated all dependencies to latest versions (of course this will be out-of-date by the time you read this)
• Remove some of the deployment targets in the Gulpfile

NOTE: just like the original project left in some bugs, I've left some linting "issues" to be cleaned up (warnings, not errors)