[FIX] ElectrodeGrid naming convention

[mbeyeler]

Fixes ElectrodeGrid naming convention when there are more than 26 alphabetic rows/columns (issue #189): new ordering is A-Z, then AA-AZ, then BA-BZ, etc.

[codecov-commenter]

Codecov Report

Merging #192 into master will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #192   +/-   ##
=======================================
  Coverage   88.96%   88.97%           
=======================================
  Files          65       65           
  Lines        5294     5295    +1     
=======================================
+ Hits         4710     4711    +1     
  Misses        584      584           

Flag	Coverage Δ
#unittests	88.97% <100.00%> (+<0.01%)	⬆️

Impacted Files	Coverage Δ
pulse2percept/implants/alpha.py	92.98% <ø> (ø)
pulse2percept/implants/argus.py	93.54% <ø> (ø)
pulse2percept/implants/base.py	95.33% <100.00%> (+0.07%)	⬆️
pulse2percept/implants/tests/test_alpha.py	100.00% <100.00%> (ø)
pulse2percept/implants/tests/test_base.py	100.00% <100.00%> (ø)

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[mbeyeler]

I see, wheels are failing because https://status.quay.io/ is down