WIP - New style database plugin

[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
• [ ] run 'make format' so as to confirm the pyexcel organisation's coding style
• [ ] Please add yourself to 'contributors' section of pyexcel-io.yml (if not found, please use CONTRIBUTORS.rst)
• [ ] Agree on NEW BSD License for your contribution

[codecov-commenter]

Codecov Report

Merging #78 into dev will increase coverage by 0.49%. The diff coverage is 96.96%.

@@            Coverage Diff             @@
##              dev      #78      +/-   ##
==========================================
+ Coverage   96.43%   96.93%   +0.49%     
==========================================
  Files          51       51              
  Lines        3229     3201      -28     
==========================================
- Hits         3114     3103      -11     
+ Misses        115       98      -17     

Impacted Files	Coverage Δ
pyexcel_io/database/common.py	100.00% <ø> (+1.04%)	:arrow_up:
pyexcel_io/writer.py	96.66% <ø> (-0.21%)	:arrow_down:
tests/test_io.py	97.90% <ø> (-0.03%)	:arrow_down:
pyexcel_io/database/importers/sqlalchemy.py	95.08% <90.90%> (+0.43%)	:arrow_up:
pyexcel_io/database/importers/django.py	98.00% <91.66%> (-2.00%)	:arrow_down:
pyexcel_io/database/__init__.py	100.00% <100.00%> (ø)
pyexcel_io/database/exporters/django.py	100.00% <100.00%> (ø)
pyexcel_io/database/exporters/sqlalchemy.py	100.00% <100.00%> (ø)
pyexcel_io/readers/csv_in_file.py	100.00% <100.00%> (+3.12%)	:arrow_up:
pyexcel_io/readers/csv_in_memory.py	100.00% <100.00%> (+2.77%)	:arrow_up:
... and 8 more

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