yachi

modernizr.js in 0.1.6 has no addTest method

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while 0.1.5 is included reference: http://www.modernizr.com/docs/#addtest

Update README

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preserve log_tags in rails application.rb config see https://github.com/rails/rails/blob/4-2-stable/railties/lib/rails/application/default_middleware_stack.rb#L35