Merge pull request #1 from ryanduan/master

简单库设。
Merge pull request #2 from ryanduan/regist

Regist
Merge pull request #3 from ryanduan/regist

login&logout
Merge pull request #4 from ryanduan/master

return username exist
display shares
add dispshare
Merge pull request #5 from ryanduan/share

Finish inquiry share
createshare
delete dbfile
update forms
add userinfo
update index
delete dbfile