Remove unused utility script

minicoin/util/get_yaml_value.rb

-require 'yaml'
-
-yaml=YAML.load(STDIN.read)
-
-exit(1) unless yaml
-
-if ARGV.count < 1
-    yaml.each do |key, value|
-        puts key
-    end
-else
-    value = yaml[ARGV[0]]
-    unless ARGV[1] == "--raw"
-        if value.is_a?(String)
-            value.gsub!("\\", "\\\\")
-            value.gsub!("\"", "\\\"")
-        end
-    end
-    puts value
-end