Fix sitewide permissions on files / folders

[stefgosselin]

Set permissions:

#  Sets all directories 775, files 664
# -  this could be 755 and 644 for tighter permissions
find . -type d -exec chmod 0775 {} \; && find . -type f -exec chmod 0664 {} \;

• Maybe set app/cache and app/logs to 0777 (though 775 can be fine).