korean translation
Update index.html
Update basics.textile
basics2 revised
collections revised
type-basics revised
advanced types revised
type-basics revised & more discussion added
advanced-types revised
advanced-types revised
Update advanced-types.textile
Update coll2.textile
Update coll2.textile
Update collections.textile
Update concurrency.textile
correct spellings
add some comments
some error fixed
fixed typos
fix typos