A better way check if Octokit basic_auth was successful

[ryanmjacobs]

We need a better way of checking whether or not the login was successful. Currently, we are just making a arbitrary API request to see if it works. If it works, then we say the login was successful; otherwise, we say it failed.

I'm sure there is a better way to do this, already built into the API.

@client = Octokit::Client.new(:login => username, :password => password)

begin
  @client.authorizations
rescue Octokit::Unauthorized
  puts "error: auth failed"
  exit                                                                
end