Add long_description to setup.py

[djhoese]

See related issue for more info.

• Closes Add README to setup.py description #397
• Tests passed
• Passes git diff origin/master **/*py | flake8 --diff

[mraspaud]

Are we not using BASE_PATH ?

[djhoese]

PyCharm said we weren't and the code that was using it was from 2010. Not sure why PyCharm and other linters didn't find it sooner.

[coveralls]

Coverage remained the same at 73.078% when pulling f59cd18 on djhoese:bugfix-long-description into f51790b on pytroll:master.

[coveralls]

Coverage remained the same at 73.078% when pulling f59cd18 on djhoese:bugfix-long-description into f51790b on pytroll:master.

[codecov]

Codecov Report

Merging #443 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #443   +/-   ##
=======================================
  Coverage   73.07%   73.07%           
=======================================
  Files         134      134           
  Lines       17662    17662           
=======================================
  Hits        12907    12907           
  Misses       4755     4755

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