Merge pull request #1 from astaxie/master

更新astaxie到456vv
Merge pull request #2 from astaxie/master

astaxie 更新到 456vv
Merge pull request #3 from astaxie/master

更新astaxie到456vv
go 1.1
Create Select.md
Update Select.md
Create SelectCase.md
Update SelectCase.md
Create SelectDir.md
Update SelectDir.md
Update SelectDir.md
Create SliceHeader.md
Update SliceHeader.md
Update SliceHeader.md
Update SliceHeader.md
Create StringHeader.md
Update StringHeader.md
Update README.md
Update Type.md
Create Type.Convertible.md