Plugin api

[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 #82 into dev will increase coverage by 0.04%. The diff coverage is 97.33%.

@@            Coverage Diff             @@
##              dev      #82      +/-   ##
==========================================
+ Coverage   96.89%   96.94%   +0.04%     
==========================================
  Files          46       49       +3     
  Lines        3189     3203      +14     
==========================================
+ Hits         3090     3105      +15     
+ Misses         99       98       -1     

Impacted Files	Coverage Δ
pyexcel_io/io.py	98.23% <0.00%> (-0.88%)	:arrow_down:
pyexcel_io/plugin_api/abstract_writer.py	87.50% <87.50%> (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/database/querysets.py	94.87% <100.00%> (-0.13%)	:arrow_down:
pyexcel_io/plugin_api/abstract_reader.py	100.00% <100.00%> (ø)
pyexcel_io/plugin_api/abstract_sheet.py	100.00% <100.00%> (ø)
pyexcel_io/readers/csv_in_file.py	100.00% <100.00%> (ø)
pyexcel_io/readers/csv_in_memory.py	100.00% <100.00%> (ø)
pyexcel_io/readers/csv_sheet.py	98.16% <100.00%> (+0.03%)	:arrow_up:
... and 10 more

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