[PERF] List comprehension to array operation in local multivariate Geary

[TLouf]

Partial fix of #181.

Passed testing with nosetests:

............................................SS.S...S.S.S.................................SSS............................
----------------------------------------------------------------------
Ran 120 tests in 19.110s

[codecov-commenter]

Codecov Report

Merging #185 (d430914) into master (620a881) will decrease coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #185      +/-   ##
==========================================
- Coverage   81.46%   81.43%   -0.03%     
==========================================
  Files          40       40              
  Lines        4062     4057       -5     
==========================================
- Hits         3309     3304       -5     
  Misses        753      753              

Impacted Files	Coverage Δ
esda/geary_local_mv.py	100.00% <100.00%> (ø)

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[jGaboardi]

Thanks for this @TLouf!