Handful of performance optimizations

[koppenheim]

Could use a second (third?) pair of eyes on these. Hence the pull request instead of a direct commit.

Here's the benchmark @richievos and I have been using (more-or-less)

require 'benchmark'
require 'cgi'

def benchmark(msg, iterations=1000, &block)
  puts "#{msg} (n=#{iterations})"
  GC.start
  #RubyProf.start
  times = Benchmark.ms do
    iterations.times(&block)
  end
  #profile = RubyProf.stop

  puts "\ttime: #{(times / iterations.to_f).round(2)}"
  #printer = RubyProf::GraphPrinter.new(profile)
  #printer.print(STDOUT)
  #printer = RubyProf::CallTreePrinter.new(profile)
  #printer.print(File.new('/var/tmp/rubyprof.output', "w"))
end

def run
  puts "===Typhoeus version: #{Typhoeus::VERSION}==="
  hydra = Typhoeus::Hydra.new
  benchmark("making couple requests") do
    request = Typhoeus::Request.new("http://internal-url.company.com?with=params", :method => :get)
    hydra.queue(request)
    hydra.run
  end
end

run

Before (pasting one sample run of many):

===Typhoeus version: 0.6.2===
making couple requests (n=1000)
        time: 3.02

After (one sample of many similar results):

===Typhoeus version: 0.6.2===
making couple requests (n=1000)
    time: 2.02

[hanshasselberg]

Looks good to me - except for the failing specs.
I'm impressed by the performance gain you archived with it!!

[craiglittle]

Nice work!