Merge pull request #173 from sallen450/master

更新 教你透彻了解红黑树
Update RBTree.md
Update Readme.md
Rename RBTree.md to 07.1.md
Update Readme.md
Add QUnit tests for chapter 01 & chapter 02
Merge pull request #174 from Frederick-S/master

用 QUnit 测试第一章和第二章 JavaScript 代码
solution code for chapter4
Merge pull request #175 from jintaoguan/master

java code for chapter4
java code for the first solution of Chapter6
Merge pull request #176 from jintaoguan/master

java code for the first solution of Chapter6