typhoeus/typhoeus — pull request #259 by findchris (2013-01-10 22:15:11+00:00)
Title: Support default_proc behavior in Ruby 1.8.x

Added ```set_default_proc_on``` to ```header.rb``` for setting the default proc on a hash regardless of Ruby version.

See here for context:
https://github.com/typhoeus/typhoeus/issues/227#issuecomment-12106819

Cheers.