fix typo

see: https://github.com/taobao/nginx-book/issues/88
     https://github.com/taobao/nginx-book/issues/44
remove autoconf and automake, add make instead
增加ngx_str_t变量定义之后再赋值的一种方法
移除ngx_prealloc()
remove autoconf and automake, add make instead

See https://github.com/taobao/nginx-book/issues/134
增加ngx_str_t变量定义之后再赋值的一种方法

See https://github.com/taobao/nginx-book/issues/139
移除ngx_prealloc()

See https://github.com/taobao/nginx-book/issues/140
Merge branch 'master' of https://github.com/ideal/nginx-book
按照nginx的风格，强制转换后增加空格
Merge pull request #141 from ideal/master

关于编译工具，ngx_str_t变量赋值，ngx_prealloc()的几处修改. Thanks to ideal.
Update chapter_02.rst

修改笔误：”是否“->”释放“
Merge pull request #143 from RocFang/patch-1

Update chapter_02.rst, fix typo, thanks to RocFang.
修改关于nginx core的描述。

See https://github.com/taobao/nginx-book/issues/144
Merge pull request #145 from chobits/master

增加对http ssl分析
Merge pull request #146 from ideal/master

修改关于nginx core的描述。Thanks to ideal.
add document about ngx_queue_t
Merge pull request #147 from ideal/master

增加ngx_queue_t数据结构的说明。感谢ideal
add a blank line after code:: tag
Merge pull request #150 from ideal/master

Add a blank line after the code:: tag in chapter 2(ngx_queue_t), thanks to ideal.
Update chapter_05.rst

memcache协议将头部信息被定义为第一行文本，可以找到这段代码证明--->memcache协议的头部信息被定义为第一行文本，可以找到这段代码证明