Remove automatic polling of remotes

[sjsrey]

This addresses #499 by no longer polling the remotes on init.

Remotes would be curated prior to each release instead.

[codecov]

Codecov Report

Merging #504 (2c3b43d) into master (390c5c4) will decrease coverage by 0.5%.
The diff coverage is 50.0%.

@@           Coverage Diff            @@
##           master    #504     +/-   ##
========================================
- Coverage    79.2%   78.7%   -0.5%     
========================================
  Files         121     122      +1     
  Lines       13016   13114     +98     
========================================
+ Hits        10306   10322     +16     
- Misses       2710    2792     +82     

Impacted Files	Coverage Δ
libpysal/examples/base.py	58.9% <0.0%> (-1.1%)	⬇️
libpysal/examples/remotes.py	74.4% <85.7%> (-21.4%)	⬇️
libpysal/common.py	63.5% <0.0%> (-26.9%)	⬇️
libpysal/weights/tests/test_nx.py	92.3% <0.0%> (-7.7%)	⬇️
libpysal/cg/tests/test_voronoi.py	82.8% <0.0%> (-6.9%)	⬇️
libpysal/io/iohandlers/db.py	41.9% <0.0%> (-6.5%)	⬇️
libpysal/weights/raster.py	57.2% <0.0%> (-3.8%)	⬇️
libpysal/cg/ops/_shapely.py	46.7% <0.0%> (-3.3%)	⬇️
libpysal/cg/ops/tests/test_tabular.py	96.8% <0.0%> (-3.2%)	⬇️
... and 15 more

[knaaptime]

sweet

[iwishiwasaneagle]

Looks good to me. Cheers for creating this fix @sjsrey!

[martinfleis]

One more thing on this. GeoPandas is deprecating datasets module (geopandas/geopandas#2751) and we want to offer a convenient way of replacing this with something like https://github.com/martinfleis/xyzdata. I've used the data we have in here right now as a test and thought that the package may eventually live under pysal org and replace libpysal.examples. Thoughts?