Rejected Columns based on co-relation type

[akhildevelops]

This PR is raised against to the Feature Request raised: #298

Helps in selecting type of Co-relation to be used in rejected Columns.

'pearson', 'spearman', 'kendall', 'phi_k'

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##             master     #299   +/-   ##
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  Files             ?       41           
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#issue	81.19% <16.66%> (?)
#unit	88.31% <100%> (?)

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pandas_profiling/__init__.py	86.48% <100%> (ø)

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[sbrugman]

Great addition, thank you.

Your pull request points out an inconsistency in the current implementation w.r.t. correlation rejection. In addition to this part of the code, describe.py also rejects columns based on a correlation threshold.

The issue #284 is also related.

This PR is a great start to resolve these three points at once.