Merge pull request #36 from suapapa/master

68,69 번역완료
translated "32 to 35 Slices"
translated "36 to 37 function values, closure"
Merge pull request #39 from pcjpcj2/patch-11

translated "32 to 35 Slices"
Merge pull request #40 from pcjpcj2/patch-12

translated "36 to 37 function values, closure"
Merge pull request #37 from suapapa/master

번역할 챕터 프린트 해 주는 스크립트 추가
Translated chapter 48, 48 and 50

* 48. Methods and Interfaces
* 49. Methods
* 50. Method continued
Translated chapter 51

* 51. Methods with pointer receivers