Display available requests number #16
Description
GitHub provides 5 000 requests per hour for authorised users. In your case authorised user is the analytics4github production server.A number of left requests can be acquired from a header of response from GitHub API. See https://developer.github.com/v3/#rate-limiting.
The goal is to display current rate limit on the application start and update after each analyse operation(unique stargazers, commits, etc.)
