Django plug-in Enhancement

[chfw]

With your PR, here is a check list:

• [ ] Has test cases written?
• [ ] Has all code lines tested?
• [ ] Has make format been run?
• [ ] Please update CHANGELOG.yml(not CHANGELOG.rst)
• [ ] Passes all Travis CI builds
• [ ] Has fair amount of documentation if your change is complex
• [ ] Agree on NEW BSD License for your contribution

[codecov-io]

Codecov Report

Merging #105 into dev will increase coverage by 0.00%. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##              dev     #105   +/-   ##
=======================================
  Coverage   97.91%   97.91%           
=======================================
  Files          52       52           
  Lines        3359     3360    +1     
=======================================
+ Hits         3289     3290    +1     
  Misses         70       70           

Impacted Files	Coverage Δ
pyexcel_io/database/common.py	100.00% <100.00%> (ø)
pyexcel_io/database/importers/django.py	100.00% <100.00%> (ø)

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