Fix problem

DB - Cancel ActiveCase table, add Warehouse table; Add function for
Warehouse: getWarehouseCase, putWarehouseCase, deleteWarehouseCase; Fix
other functions that reference to ActiveCase.

analyzer - fix format problems; Cut out parsing logic part from run and
encapsulate to __parsePageContent. Fix re-put active case back to task
queue. Fix parsing logic so that adapt to new database model.

server.py - Find and fix bug when export excel file