ENH: added an optional css id to <table> tags created by frame.to_html

[samghelms]

This is useful for the reasons mentioned in #8496

• Automatically create a random id for tables created using _repr_html_ using uuid.

• Also updated test_repr_html_float to be more descriptive and avoid conflicts with random numbers in the id for_repr_html_

• closes Add table id option to pandas.DataFrame.to_html  #8496

• tests added / passed

• passes git diff upstream/master -u -- "*.py" | flake8 --diff

• whatsnew entry

[pep8speaks]

Hello @samghelms! Thanks for submitting the PR.

• In the file pandas/core/frame.py, following are the PEP8 issues :

Line 1763:76: W291 trailing whitespace

• In the file pandas/io/formats/format.py, following are the PEP8 issues :

Line 750:47: E251 unexpected spaces around keyword / parameter equals
Line 750:49: E251 unexpected spaces around keyword / parameter equals

• In the file pandas/tests/io/formats/test_to_html.py, following are the PEP8 issues :

Line 1874:1: W391 blank line at end of file