Account for the true location of wp-content in our boilerplate nginx config

In the future, this can be overwritten with custom nginx configurations
s/name/server_name/ in nginx config
Progress toward a more flexible nginx configuration

This restricts things to directory and wp_directory, but leads forward toward a better solution
Update max POST and upload size to 50M
Merge pull request #53 from washingtonstateuniversity/fix-30

[PR] Update to sites.sls structure for nginx configuration