Add filters to always allow comments, as these sites are private.
Filter the allowed list of upload filetypes on the network.
Move P2 config filters to common file
Remove unused mu-plugin
Add more default comment settings filters, use __return_zero
Merge upstream changes from WP By Email

Brings in up to feaca68ede
Add a per site name to notification emails
Update notification email to show network and site name
Try to use a dynamic server name for the from address
Filter blog_public option to enforce Restricted Site Access
Add a responsive P2 child theme
Update responsive P2 theme with stylesheet URI changes

This is a pull request on the upstream project.
.gitignore some dev files for WP By Email
Merge pull request #9 from washingtonstateuniversity/p2config

[PR] Updates to P2 Configuration