Add a WordPress trunk installation to the default setup

Use SVN to checkout the latest trunk in provisioning. On the first install we then use wp-cli to complete the setup. On repeat provisionings, trunk is updated with svn pull.
Modify documentation to reference new trunk installation of WordPress
Updated documentation for the local WordPress nginx configuration
Move config from local.wordpress.dev.conf into default.conf

default.conf is a better place for the default nginx site configurations included with this setup. This moves both WordPress configs from local.wordpress.dev.conf into default.conf and then deletes the local.wordpress.dev.conf file
Additional documentation for default nginx servers config
Additional documentation for the sample nginx configuration
Clean up gitignore after removal of previous file
Rename testin.com.conf-sample to more appropriate local-nginx-example.conf-sample