Update outdated matplotlib URIs.
Update NumPy website.
Update official Python URIs.
Update SciPy links.
Update IRIS hosted URIs.
Update geopy URI.
Make PyPI links HTTPS.
Fix links to source files.
Update URIs that are redirecting.
Update URIs that are now 404.
Bump NumPy version to match wheelhouse.
Merge pull request #884 from QuLogic/doc-linkcheck

Update doc links
minor docstring refactoring
Add ZMAP write support for earthquake catalogs
Improve python 3 compatibility

...by explicitly encoding/decoding strings when writing/reading to files.
Fix minor issues
Open files in context, minor improvements
Minor improvements
Add ZMAP read support
Remove unused doctests