Updating consensus.py to also work with input files

[gwaybio]

closes #107 and other updates

[codecov-io]

Codecov Report

Merging #115 (9f8677b) into master (b039f14) will increase coverage by 0.11%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #115      +/-   ##
==========================================
+ Coverage   98.49%   98.61%   +0.11%     
==========================================
  Files          45       45              
  Lines        1859     1872      +13     
==========================================
+ Hits         1831     1846      +15     
+ Misses         28       26       -2     

Impacted Files	Coverage Δ
pycytominer/aggregate.py	96.15% <ø> (+7.69%)	⬆️
pycytominer/consensus.py	100.00% <100.00%> (ø)
pycytominer/tests/test_aggregate.py	100.00% <100.00%> (ø)
pycytominer/tests/test_consensus.py	100.00% <100.00%> (ø)
pycytominer/tests/test_cyto_utils/test_cells.py	100.00% <100.00%> (ø)

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