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add the lca for bst recusive version
Merge pull request #225 from fairywell28/master

add the lca for bst recusive version
create 08.4
Update 02.01.md
Merge remote-tracking branch 'bob/master'
rename images/8/08.4 to images/8/8.4
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Merge pull request #226 from edwardwang-cn/master

[已完成] 8.4：从Trie树（字典树）谈到后缀树（10.28修订）
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Update 08.04.md