Hide WordPress Version

Removes the WordPress version string from:

• The $wp_version global variable (frontend only)
• Generator tag output (removed entirely)
• ‘Right Now’ admin dashboard widget (non-admins)
• Admin dashboard footer (non-admins)
• Scripts and stylesheets enqueued without a version declared
• HTTP queries
• XML-RPC responses
• Pingbacks
• Bloginfo() calls

Also removes the update notice in the admin for non-admins.