build metadata from source instead of hitting w.org api

[chuckadams]

The code that builds metadata can be found here:

• Themes: WPORG_Themes_Upload::import()
  • Calls constructor of WP_Theme in wp-includes/class-wp-theme.php
• Plugins: Import::import_from_svn
  • Calls get_plugin_data() defined in wp-admin/includes/plugin.php

[chuckadams]

Checking out the entire svn repos of plugins and themes appears to be too big a job for subversion, which regularly falls on its face in the attempt. For the initial implementation, concentrating on git instead seems the wiser move, and will move us closer toward first-party publishing via packagist. Once that's done, we can expand to include svn, one plugin at a time.