Switch to passport-github2 to handle github API updates

[jbothma]

Fixes this error which occurs when trying to authenticate via github

nodejs | error { failed to fetch user profile (status: 400 data: {"message":"Must specify access token via Authorization header","documentation_url":"https://docs.github.com/v3/#oauth2-token-sent-in-a-header"})
nodejs | at /home/app/nodemodules/passport-github/lib/passport-github/strategy.js:90:28
nodejs | at passBackControl (/home/app/nodemodules/oauth/lib/oauth2.js:132:9)
nodejs | at IncomingMessage.<anonymous> (/home/app/nodemodules/oauth/lib/oauth2.js:157:7)
nodejs | at IncomingMessage.emit (events.js:203:15)
nodejs | at endReadableNT (streamreadable.js:1145:12)
nodejs | at process.tickCallback (internal/process/nexttick.js:63:19)
nodejs | name: 'InternalOAuthError',
nodejs | message: 'failed to fetch user profile',
nodejs | oauthError:
nodejs | { statusCode: 400,
nodejs | data:
nodejs | '{"message":"Must specify access token via Authorization header","documentationurl":"https://docs.github.com/v3/#oauth2-token-sent-in-a-header"}' } }

[impronunciable]

thank you @jbothma

Is it ok if I add you as collaborator?

[jbothma]

Sure! :) thanks!