Authenticate every github call

Problem: Github is rate limiting Code Triage result resulting in repos with no issues and therefore plenty of users with no emails :(

Solution: Add a random github user token to EVERY CALL. Github gives you more calls when you're using a token. 

Do i love it: no. Will it work: probably.

Feedback? cc/ @neilmiddleton @parndt
Merge pull request #97 from codetriage/schneems/api-rate-limit

Authenticate every github call