testBlank
fix a typo error
set audittype as nullable
ca1
sc2
set default ForeignKey
fix typo mistake
a pile of shit
fix the ForeignKey default value error
change the orders of description model
change ForeignKey to ManyToMany
Merge branch 'testBlank' of github.com:yuealves/paper into testBlank

Conflicts:
	statistic/models.py
dumpdata
fix a history bug