Feature/refactored pca (#79)

* compute zscore function

* test case for computing zscore

* function to compute pca

* generate scree plot data

* generate  new pca trait data from zscores and eigen_vec

* remove redundant functions

* generate factor loading table data

* generate pca temp dataset dict

* variable naming and error fixes

* unit test for processing factor loadings

* minor fixes for generating temp pca dataset

* pass datetime as argument to generate_pca temp dataset function

* add unittest  for caching pca datasets

* cache temp datasets

* ignore missing imports for sklearn

* mypy fixes

* pylint fixes

* refactor tests for pca

* remove ununsed imports

* fix for generating pca traits vals

* mypy and code refactoring

* pep8 formatting and add docstrings

* remove comments /pep8 formatting

* sort eigen vectors based on  eigen values

* minor fix for zscores

* fix for rounding variance ratios

* refactor tests

* rename module to pca

* rename datasets to traits

* fix failing tests

* fix caching function

* fixes return x and y coordinates for scree plot

* expand exception scope

* fix for deprecated numpy.matrix function

* fix for failing tests

* pep8 fixes

* remove comments

* fix merge conflict

* pylint fixes

* rename module name to test_pca

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