Add encoding line to all spec files

gistfile1.rb

enc = '# -*- encoding : utf-8 -*-'

`git ls-files -- spec | xargs head -1 | grep -v encoding`.
  split("\n\n").
  reject{|l| l !~ /\n/}.
  map{|l| l.split("\n").first}.
  map{|f| f[/^==> (.*) <==$/, 1]}.
  each{|f|
    system "echo '#{enc}' > tempfile && cat #{f} >> tempfile && mv tempfile #{f}"
  }