updated for Symphony 2.3 compatibility
fixed extension.driver.php Administration::Configuration() info
fixed export destination, so when you put in a custom export destination, it will use the DOCROOT as the custom root instead of the extension folder that way you'll be able to determine wherever you want to output the zip file.
Updated README to reflect the custom export location instructions
fixed Administration::Configuration() typos in extension.driver.php
Merge pull request #2 from bzerangue/master

Updated this extension for Symphony 2.3 compatibility