Keep github oauth tokens on the client side

[tpatja]

User Story

As a user, I expect commiteth to respect my privacy and not store my github oauth token on the server.

Description

Type: Enhancement

Summary: There should be no need to store github oauth tokens on the server.

Solution

• after successful redirect to commiteth.com, pass token to client-side and put it in localStorage on the client, avoiding the need to store the token on the server
• each commiteth HTTP API call that uses functionality in the github API requiring the user's token should be passed the token (we use ssl, so no security issue here)