Add output encode option (-o)

Usage:
  ShiftJIS:  pt -o sjis pattern
  EUCJP:     pt -o euc  pattern
  ISO2022JP: pt -o jis  pattern
Merge pull request #21 from ongaeshi/master

Add output encode option (-o)
Merge branch 'master' into patch/input_pipe

Conflicts:
	search/option/option.go