Update from OldCoder Oberyn

Revision更新到Beta4
Update from OldCoder Oberyn

完成了history revision的翻译，同时完成部分校对
Merge pull request #291 from oldcodeoberyn/gh-pages

Update from OldCoder Oberyn
Merge pull request #290 from littlekok/develop

Ballons 博文翻译 by Arya
校正了部分revision history的内容

from OldCoder Oberyn
Accessing and Modifying an Array

根据8-4号更新内容更新了 Accessing and Modifying an Array这一章
8/14/ 9:55
Merge branch 'develop' of https://github.com/colourful987/the-swift-programming-language-in-chinese into develop
Merge pull request #292 from colourful987/develop

Accessing and Modifying an Array
Merge pull request #293 from oldcodeoberyn/gh-pages

校正了部分revision history的内容
校验了Balloons博客
翻译了Swift博客中的Interacting with C Pointers
Merge pull request #294 from colourful987/develop

校验了Balloons博客
Merge pull request #295 from PENGUINLIONG/gh-pages

翻译了Swift博客中的Interacting with C Pointers