Merge pull request #2 from huxiaoqian/master

fix about index
Merge pull request #3 from huxiaoqian/master

xapian_case配置说明
fix on xapian_case
Merge branch 'master' of https://github.com/linhaobuaa/xapian_case
Merge branch 'master' of https://github.com/huxiaoqian/xapian_case