Factorize routing

[submarcos]

• pgRouting is not required anymore until you need routing features.
• Factorization of all relating routing code to geostore.routing module
• Allow custom tolerance usage in topology creation / update
• Improve routing API response to include feature list
• Add indexes on routing specific database columns
• Improve documentation and set Makina Corpus theme

[codecov]

Codecov Report

Merging #43 into master will increase coverage by 0.09%.
The diff coverage is 97.67%.

@@            Coverage Diff             @@
##           master      #43      +/-   ##
==========================================
+ Coverage   95.75%   95.85%   +0.09%     
==========================================
  Files          38       40       +2     
  Lines        1720     1735      +15     
==========================================
+ Hits         1647     1663      +16     
+ Misses         73       72       -1     

Impacted Files	Coverage Δ
geostore/routing/serializers/mixins.py	87.50% <87.50%> (ø)
geostore/routing/views/mixins.py	96.42% <95.45%> (+0.59%)	⬆️
geostore/models.py	98.31% <100.00%> (-0.01%)	⬇️
geostore/permissions.py	86.95% <100.00%> (+3.62%)	⬆️
geostore/routing/db/mixins.py	100.00% <100.00%> (ø)
geostore/routing/decorators.py	100.00% <100.00%> (ø)
geostore/routing/helpers.py	97.40% <100.00%> (+1.45%)	⬆️
...ore/routing/management/commands/update_topology.py	100.00% <100.00%> (ø)
geostore/serializers/__init__.py	97.33% <100.00%> (-0.07%)	⬇️
geostore/views/__init__.py	97.61% <100.00%> (+0.52%)	⬆️
... and 5 more

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