a small problem in new version 0.3.6!

[Lagikna]

System and QuLab version:

• win7
• Python 3.6.3
• QuLab 0.3.6

Steps to reproduce:

• Code:

import lab
lab.login('lzy','12345678')

Expected behavior:

Actual behavior:

• Crash report:

ImportError                               Traceback (most recent call last)
<ipython-input-3-6a894e955054> in <module>()
----> 1 import lab
      2 lab.login('lzy','12345678')

b:\winpython-64bit-3.6.3.0qt5\python-3.6.3.amd64\lib\site-packages\lab\__init__.py in <module>()
----> 1 from . import admin, util, waveform
      2 from ._app import (Application, Sweep, exportApps, getAppClass, importApps,
      3                    make_app)
      4 from ._bootstrap import (connect_db, get_current_notebook, get_current_user,
      5                          get_inputCells, listApps, listOneApp, listDrivers,

b:\winpython-64bit-3.6.3.0qt5\python-3.6.3.amd64\lib\site-packages\lab\admin.py in <module>()
      1 import getpass
      2 
----> 3 from . import _bootstrap, db
      4 
      5 

b:\winpython-64bit-3.6.3.0qt5\python-3.6.3.amd64\lib\site-packages\lab\_bootstrap.py in <module>()
     10 from mongoengine.connection import connect, disconnect
     11 
---> 12 from . import _importer, db, ui
     13 from .config import config
     14 

b:\winpython-64bit-3.6.3.0qt5\python-3.6.3.amd64\lib\site-packages\lab\_importer.py in <module>()
      5 import sys
      6 
----> 7 from lab.config import caches_dir
      8 
      9 from . import db

ImportError: cannot import name 'caches_dir'

[Lagikna]

lab.config里加上导入caches_dir就可以了