genesis:permissions should run with sudo

[ericclemmons]

Just to make sure we don't have any problems with previously uploaded images & permissions...

[ericrasch]

Just got this when trying to deploy to production for a site:

 2013-11-06 15:08:00 executing `genesis:permissions'
  * executing "find /var/www/mywebsite.com/master/current/web -follow -type d -exec chown :www-data {} \\;"
    servers: ["production.mywebsite.com"]
    [production.mywebsite.com] executing command
 ** [out :: production.mywebsite.com] chown: changing group of `/var/www/mywebsite.com/master/current/web/wp-content/uploads/2013/11': Operation not permitted
    command finished in 9546ms
  * executing "find /var/www/mywebsite.com/master/current/web -follow -type d -exec chmod 775 {} \\;"
    servers: ["production.mywebsite.com"]
    [production.mywebsite.com] executing command
 ** [out :: production.mywebsite.com] chmod:
 ** [out :: production.mywebsite.com] changing permissions of `/var/www/mywebsite.com/master/current/web/wp-content/uploads/2013/11'
 ** [out :: production.mywebsite.com] : Operation not permitted
 ** [out :: production.mywebsite.com] 
    command finished in 4663ms

[EvanK]

W/r/t permissions issues, see also #35, #33, #30, #20, #12