Last time index

[kmax12]

Adds last_time_index property to Entity. For each instance in the entity, the last time index refers to the most recent event associated with that instance. For entities without child entities, this would be the time index of that entity. For an instance of an entity with children, it would be the most recent last_time_index among associated instances on the child entities. When using training windows while calculating a feature matrix, instances with last_time_indexes that are not as recent as the edge of the training window will excluded from the data.

[codecov-io]

Codecov Report

Merging #33 into master will decrease coverage by 1.11%.
The diff coverage is 97.82%.

@@            Coverage Diff             @@
##           master      #33      +/-   ##
==========================================
- Coverage   88.05%   86.93%   -1.12%     
==========================================
  Files          73       73              
  Lines        6730     6851     +121     
==========================================
+ Hits         5926     5956      +30     
- Misses        804      895      +91

Impacted Files	Coverage Δ
featuretools/demo/mock_customer.py	14.28% <0%> (-0.43%)	⬇️
featuretools/demo/flight.py	25.92% <0%> (-1%)	⬇️
...utational_backend/test_calculate_feature_matrix.py	98.34% <100%> (+0.07%)	⬆️
featuretools/entityset/entity.py	76.47% <100%> (+0.63%)	⬆️
...aturetools/tests/entityset_tests/test_pandas_es.py	99.72% <100%> (ø)	⬆️
featuretools/entityset/entityset.py	87.26% <100%> (-0.33%)	⬇️
featuretools/demo/retail.py	100% <100%> (ø)	⬆️
featuretools/entityset/serialization.py	18.84% <0%> (-77.94%)	⬇️
... and 8 more

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