fixed requires for faraday + typhoeus

[spnkr]

If using typhoeus as the adapter Ethon::Errors::InvalidOption: The option: disable_ssl_peer_verification is invalid. is thrown unless these two requires are added to lib/faraday/*.rb

require 'faraday'
require 'typhoeus' #+
require 'typhoeus/adapters/faraday' #+

by adding these requires (commented out) it is now easier to use typhoeus—all you have to do is uncomment out the requires and change the DEFAULT_ADAPTER to :typhoeus in configuration.rb

this is an implementation of typhoeus/typhoeus#270

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