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Speed up HTML encoder for 1.2#153

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  • create less objects during setup
  • cache most recent 100 escaped strings
  • don't extend output unless necessary
  • lazy CSS loading and parsing

Quick benchmarking yields a ~10% speedup for Ruby code:

2.3.0@coderay ~/ruby/coderay:master rake bench/Users/murphy/.rvm/rubies/ruby-2.3.0/bin/ruby bench/bench.rb ruby html 3000encoding 3000 kB of ruby code to html...run 1:  1.69 s, 1774 kB/srun 2:  1.67 s, 1794 kB/srun 3:  1.68 s, 1786 kB/srun 4:  1.66 s, 1805 kB/srun 5:  1.69 s, 1775 kB/s2.3.0@coderay ~/ruby/coderay:possible-speedups rake bench/Users/murphy/.rvm/rubies/ruby-2.3.0/bin/ruby bench/bench.rb ruby html 3000encoding 3000 kB of ruby code to html...run 1:  1.49 s, 2010 kB/srun 2:  1.49 s, 2011 kB/srun 3:  1.49 s, 2014 kB/srun 4:  1.50 s, 1994 kB/srun 5:  1.49 s, 2017 kB/s

@ghostghost assignedkornyAug 31, 2013
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