Basic auth

[gil--]

This pr introduces VERY basic auth functionality. A follow-up PR will address many of the shortcomings (Error handling, etc.)

Features Introduced:

• [x] Register
• [x] Login
• [x] Logout
• [x] Set Customer Token to global state
• [x] LocalStorage to persist such as closing browser OR, navigating to offsite Shoppify checkout
• [x] Account Layout Component (Wrap all account pages with this component to automatically handle authentication check)
• [x] Basic Account Dashboard
• [x] Password Reset (with encoded customerID workaround per https://github.com/Shopify/storefront-api-examples/issues/31)

Moved to Followup Account PR:

• [ ] My Orders Page
• [ ] Account Info Update Page

[codeclimate[bot]]

Code Climate has analyzed commit 21f94d09 and detected 2 issues on this pull request.

Here's the issue category breakdown:

Category	Count
Duplication	2

View more on Code Climate.

[gil--]

This whole PR/auth-flow really lacks proper error handling and messaging. Also would be ideal to add unit tests with example customer hydrated for integration testing...