fuck microsoft, default_characters = GBK

Signed-off-by: Jack <jack.wgm@gmail.com>
format default to use C locale.

Signed-off-by: Jack <jack.wgm@gmail.com>
change utf8.hpp source file encode to utf8.

Signed-off-by: Jack <jack.wgm@gmail.com>
添加BOOST版本检测, 低于boost-1.48将在编译期输出错误信息.

Signed-off-by: Jack <jack.wgm@gmail.com>
Merge pull request #9 from avplayer/master

又一些更新