Fully support ES6 and babel

@gesposito fixed up Gatsby's support for Babel in #31 as well as converting the starter blog to ES6

Thanks!

Fix path error on builds for non-index pages

@phlogisticfugu created a PR to fix #14

Fix "Cannot find module" error"

Bugs fixed:

• #11 Error: Cannot find module '../lib/utils/init-starter' on second step of tutorial

0.2.0

First somewhat stable public release

Features added:

• Install pre-built starter sites from Github.
• Support adding link prefixes e.g. for Github sites.
• Added two demo/starter sites, a blog and documentation site
• Added two helper functions for auto-prefixing links and for finding the child pages for a template.