go-tour: add Korean translation

R=adg
CC=golang-dev
https://codereview.appspot.com/32170043
go-tour: add Type Conversions and Arrays pages

Also:
- small tweaks to the variables and slice examples,
- a link to image/color from the images exercise.

Fixes issue 168.

R=golang-dev, dominik.honnef, r
CC=golang-dev
https://codereview.appspot.com/16490043
gotour: update Chinese translation link label

"普通话" is a standard Chinese pronunciation, not include Chinese character.

R=golang-dev, minux.ma
CC=golang-dev
https://codereview.appspot.com/38310044

Committer: Shenghou Ma <minux.ma@gmail.com>
go-tour: improve the slide on interfaces.

R=r
CC=golang-codereviews, golang-dev
https://codereview.appspot.com/45880043
Merge branch 'master' of hg::https://code.google.com/p/go-tour
Güncelle

- Yeni slayt: Tür dönüşümleri
- Yeni slayt: Diziler
- Kore çevirisine link ekle
- color paketine link ekle