Add ja.wordpress.dev site and sample content.

The Nginx config, localization, and hostname were already provisioned in 8f5e7190b45ea9da91d3701fba2fa2119af1e738.

Fixes #3
Add TODO to improve downloading localizations
Add es_ES Rosetta translations to global.wordpress.dev.sh
Merge pull request #5 from ntwb/patch-2

global.wordpress.dev: Add es_ES Rosetta localizations.
Remove VVV

This is the first step in migrating the repository to simply be a collection of provision scripts that runs on top of an existing VVV installation, rather than a complete fork of VVV.
Re-add provision scripts in VVV's Auto Site Setup format.

This is step two of three.
Update documentation to reflect new Auto Site Setup format.

This is the final step; see previous two commits for details.
Recommend installing vagrant-hostsupdater
Clarify the nature and mechanics of the repository.
Add `sandbox-functionality.php` plugins.

There were accidentally left out of the transition from the full VVV fork.
Extract duplicated code to pull global header/footer into helper functions.
Add whitespace between short description, long description, and parameters.
Prefix helper function names to avoid collisions.
Extract duplicated code to create Nginx logs into helper function.
Extract duplicated code to import MySQL database into helper function.
Use a variable for the site domain instead of hardcoding it in multiple places.
Clarify where the sites will be created.

Since VVV also stores the provision scripts in `www`, people might be confused.
Add more TODOs.