fix file.hpp encoding problem
添加常用　http 头为常数
add static to storage_interface* default_storage_constructor()
Merge branch 'master' of github.com:avplayer/avhttp
add const to options.find()
add SP after namespace httpoptions
Ignore case on find

Signed-off-by: Jack <jack.wgm@gmail.com>
allow find return as rvalue
improve code style

Signed-off-by: Jack <jack.wgm@gmail.com>
fixed vc2012 project

Signed-off-by: Jack <jack.wgm@gmail.com>
fixed support multi same item on option

Signed-off-by: Jack <jack.wgm@gmail.com>
add missing include <boost/algorithm/string.hpp>

Signed-off-by: Jack <jack.wgm@gmail.com>
Merge pull request #1 from avplayer/master

修正一些bugs