Initial support for WordPress develop.svn

* Maintains a new copy of WordPress via develop.svn.wordpress.org in www/wordpress-develop
* Adds the `srv.wordpress-develop.dev` domain pointing to the src/ directory
* Sets up a new wordpress_develop_src database for the new installation of WordPress to use

Working toward #113
Build develop/src into develop/build with npm/grunt

* Changes some of the naming from the last commit to eliminiate 'src' specific references
* Use npm and grunt on first provision to initialize the project
* Adds support for another domain - build.wordpress-develop.dev

This makes the decision that we take care of running `grunt` the first time just to get the build directory in action. Additional runs of `grunt` should be up to the dev when making core changes.

Work toward #113