Update documentation

[gerritholl]

Update and improve documentation

[codecov[bot]]

Codecov Report

Merging #72 (9c2d35a) into master (aaf0121) will decrease coverage by 0.61%. The diff coverage is n/a.

:exclamation: Current head 9c2d35a differs from pull request most recent head 32ad5c5. Consider uploading reports for the commit 32ad5c5 to get more accurate results

@@            Coverage Diff             @@
##           master      #72      +/-   ##
==========================================
- Coverage   69.21%   68.60%   -0.62%     
==========================================
  Files          16       15       -1     
  Lines        3843     3816      -27     
==========================================
- Hits         2660     2618      -42     
- Misses       1183     1198      +15     

Impacted Files	Coverage Δ
fogpy/utils/__init__.py	31.81% <0.00%> (-68.19%)	:arrow_down:
fogpy/composites.py	98.93% <0.00%> (-0.07%)	:arrow_down:
fogpy/filters.py	64.29% <0.00%> (ø)
fogpy/__init__.py	100.00% <0.00%> (ø)
fogpy/algorithms.py	64.05% <0.00%> (ø)
fogpy/test/__init__.py	44.44% <0.00%> (ø)
fogpy/utils/add_synop.py	0.00% <0.00%> (ø)
fogpy/test/test_filters.py	92.43% <0.00%> (ø)
fogpy/utils/export_synop.py	0.00% <0.00%> (ø)
fogpy/utils/import_synop.py	6.31% <0.00%> (ø)
... and 6 more

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