Handle unicode encoding in repr throughout Featuretools

[kmax12]

No description provided.

[codecov-io]

Codecov Report

Merging #161 into master will decrease coverage by <.01%.
The diff coverage is 96.55%.

@@            Coverage Diff             @@
##           master     #161      +/-   ##
==========================================
- Coverage   93.02%   93.02%   -0.01%     
==========================================
  Files          72       72              
  Lines        7741     7740       -1     
==========================================
- Hits         7201     7200       -1     
  Misses        540      540

Impacted Files	Coverage Δ
featuretools/entityset/relationship.py	82.6% <ø> (ø)	⬆️
...tests/computational_backend/test_pandas_backend.py	100% <ø> (ø)	⬆️
featuretools/entityset/base_entity.py	82.2% <ø> (ø)	⬆️
featuretools/variable_types/variable.py	91.66% <ø> (ø)	⬆️
featuretools/primitives/primitive_base.py	90.83% <ø> (ø)	⬆️
featuretools/primitives/cum_transform_feature.py	97.63% <100%> (ø)	⬆️
...aturetools/tests/entityset_tests/test_pandas_es.py	99.75% <100%> (ø)	⬆️
...ols/tests/dfs_tests/test_deep_feature_synthesis.py	98.32% <100%> (ø)	⬆️
...ols/tests/feature_function_tests/test_agg_feats.py	98.52% <100%> (ø)	⬆️
featuretools/tests/entityset_tests/test_es.py	98.97% <100%> (-0.02%)	⬇️
... and 4 more

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