DOC: Doc build for a single doc made much faster, and clean up#24428

Merged

datapythonista merged 13 commits intopandas-dev:masterfrom

datapythonista:single_doc

Dec 30, 2018

Commits on Dec 14, 2018

WIP: Major refactoring and clean up, still some problems on building the api pages
datapythonista
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building only api pages when needed, based on SPHINX_PATTERN, and not regex
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Commits on Dec 23, 2018

Merge from master
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Commits on Dec 24, 2018

Merge remote-tracking branch 'upstream/master' into single_doc
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Commits on Dec 26, 2018

Commits on Dec 28, 2018

Merging from master
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Commits on Dec 29, 2018