Mock HTTP-Requests and django file storage in tests

[jedie]

Additional changes:

• Use requests in for_runners/weather.py
• Cache OSM reverse requests

[codecov]

Codecov Report

Merging #17 (1ca9e9f) into master (40fe27d) will increase coverage by 0.78%.
The diff coverage is 99.37%.

@@            Coverage Diff             @@
##           master      #17      +/-   ##
==========================================
+ Coverage   72.75%   73.53%   +0.78%     
==========================================
  Files          74       75       +1     
  Lines        2606     2687      +81     
==========================================
+ Hits         1896     1976      +80     
- Misses        710      711       +1     

Impacted Files	Coverage Δ
src/for_runners/weather.py	89.32% <87.50%> (-0.59%)	⬇️
src/for_runners/geo.py	93.33% <100.00%> (+4.04%)	⬆️
src/for_runners/services/gpx_create.py	88.63% <100.00%> (+0.26%)	⬆️
src/for_runners/tests/fixture_files/__init__.py	100.00% <100.00%> (ø)
src/for_runners/tests/test_admin.py	100.00% <100.00%> (ø)
src/for_runners/tests/test_command_import.py	100.00% <100.00%> (ø)
src/for_runners/tests/test_geo.py	100.00% <100.00%> (ø)
src/for_runners/tests/test_services_gpx_create.py	100.00% <100.00%> (ø)
src/for_runners/tests/test_weather.py	100.00% <100.00%> (ø)
src/for_runners/tests/utils.py	100.00% <100.00%> (ø)
... and 4 more

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