start improving UI
Finish tranforming the index.html (to index.jsp) and
participantmangementapplication.jsp to bootstrap style.
Transform status managementapplication to bootstrap style.
Fix link bugs
Fix the bug: the form couldn't submit without name="";
Finish timeline view of statuses based on group, date and time interval
(by asking user database for exp time interval and ask status database
for the statuses in that interval); Change Var in status DB: using date
for timestamp; Change Var in user DB: using date for exp date, admin is
deleted cause it is redundant for the purpose of safty check while the
jsps already check whether the user is admin or not, variables ending
with "ForExp" are changed to "OfExp" becuase of the grammer issue.