DOC cleaning up files after running doctests #398
Merge pull request #481 from sjsrey/docs

DOC contrib updates and links
Merge pull request #482 from sjsrey/remove_test_files

DOC cleaning up files after running doctests #398
Forwarding Phil's commit: skipping doctests, conditional skip of unit tests
Merge pull request #483 from pedrovma/spreg18

Forwarding Phil's commit: skipping doctests, conditional skip of unit tests
ENH: cleaning up more test generated files