Add WORDPRESS_HOST heroku config var

[martinandert]

This, together with WORDPRESS_VERSION, allows the buildpack to download a pre-localized Wordpress version. The default setting for WORDPRESS_HOST is "wordpress.org".

Example:

heroku config:set WORDPRESS_HOST=de.wordpress.org
heroku config:set WORDPRESS_VERSION=3.9.1-de_DE

This will download Wordpress from http://de.wordpress.org/wordpress-3.9.1-de_DE.tar.gz

[okko]

Thanks for contributing!

Based on my experience there's no point in downloading a different language version of WordPress. The core is same in all languages and the buildpack only uses the core. Language-dependant stuff is in wp-content that is not provided by the buildpack. The documentation in this pull request is thus a bit misleading. Specifying an alternative host for downloading might be okay, would you like to update the documentation to only instruct WORDPRESS_HOST as a configuration param and not tie the version to it?

It would also be good to prefix all buildpack settings with "BUILDPACK_", so WORDPRESS_HOST could/should be BUILDPACK_WORDPRESS_HOST. We might migrate the other vars to this scheme later, I haven't discussed this yet with @mchung. Especially the current buildpack variable "S3_BUCKET" can collide with a bucket setting of the production site, but this is a separate discussion.