Merge pull request #22 from roselone/master

before hw 3
modify User UserManager Plan PlanManger Site SiteManager and build BXLTest
modify User UserManager Plan PlanManger Site SiteManager and build BXLTest 2nd
modify User UserManager Plan PlanManger Site SiteManager and build BXLTest 2nd
Merge pull request #38 from bxl1989/master

modify User UserManager Plan PlanManger Site SiteManager and build BXLTest