prevent warnings

faraday 0.8.4 automatically requires utils already, and uses the full path.  see https://github.com/lostisland/faraday/blob/v0.8.8/lib/faraday.rb#L129

this was generating these warnings:

    /Users/jordan/.rvm/gems/ruby-1.8.7-p358/gems/faraday-0.8.8/lib/faraday/utils.rb:18: warning: already initialized constant KeyMap
    /Users/jordan/.rvm/gems/ruby-1.8.7-p358/gems/faraday-0.8.8/lib/faraday/utils.rb:175: warning: already initialized constant ESCAPE_RE
    /Users/jordan/.rvm/gems/ruby-1.8.7-p358/gems/faraday-0.8.8/lib/faraday/utils.rb:185: warning: already initialized constant DEFAULT_SEP