MAINTENANCE: Automated closing of pull requests.

This commit exists to close the following pull requests on Github:

Closes #706 (close requested by 'pwendell')
Closes #453 (close requested by 'pwendell')
Closes #557 (close requested by 'tdas')
Closes #495 (close requested by 'tdas')
Closes #1232 (close requested by 'pwendell')
Closes #82 (close requested by 'pwendell')
Closes #600 (close requested by 'pwendell')
Closes #473 (close requested by 'pwendell')
Closes #351 (close requested by 'pwendell')