fix #94
支持班组用户多对多
fix #147
仓单列表中存放点没有的时候，展示为None。 并且未选择存放点的仓单不能再选择。
Merge remote-tracking branch 'origin/master' into issue94
Merge remote-tracking branch 'origin/master' into issue94
不需要展示皮重
add off-duty
add default order
fix bug
Merge remote-tracking branch 'origin/issue142' into issue94

Conflicts:
	lite_mms/portal/delivery/views.py
fix bug
fix bug
 when closing a delivery_session, it doesn't clear the store_bills' delivery_session_id which are actually not delivered
fix bug
 when create a new delivery task
Merge remote-tracking branch 'origin/master' into issue94
fix bug
fix #162
fix #162
fix #162
Merge branch 'master' into issue94

Conflicts:
	lite_mms/portal/delivery_ws/webservices.py
quantity can be 0
add spec and type