renaming 2.7 files
Merge branch 'master' of https://github.com/mysql2cn/manual56
15.07.06 提交
15.07.04  15.07.05 提交

添加内容作为初稿
Merge pull request #1 from xiangp152/master

15章文件合并
adding 2.8 2.9 15.06.03
Merge branch 'master' of https://github.com/mysql2cn/manual56
Merge branch 'master' of github.com:pwzhu/manual56
 Changes to be committed:
'wq' 不是内部或外部命令，也不是可运行的程序
或批处理文件。
合并
Merge pull request #219 from diguage/master

合并藏鹏的提交
Merge branch 'master' of github.com:sdyi/manual56 into sdyi-master
Merge pull request #220 from diguage/master

merge
Merge pull request #221 from pwzhu/master

adding chapter 2 and chapter 15 contents
添加 17.5章节部分内容初稿
add space
Merge branch 'master' of github.com:mysql2cn/manual56
the fifth commit by lidan ,adds chapter 13.5 and chapter 13.6 have fun
add space
add space