CC-3297: Depend on zendframework and php-pear as external packages

-Remove dependency on included Zend files.
-Remove included Zend files
-Zend is now external dependency

install_minimal/upgrades/airtime-1.8.0/airtime-upgrade.php

@@ -51,8 +51,7 @@ $CC_CONFIG = array(
     'soundcloud-connection-retries' => $values['soundcloud']['connection_retries'],
     'soundcloud-connection-wait' => $values['soundcloud']['time_between_retries'],
 
-    "rootDir" => __DIR__."/../..",
-    'zendPath'      =>  dirname(__FILE__).'/../../library/Zend'
+    "rootDir" => __DIR__."/../.."
 );
 
 AirtimeInstall::DbConnect(true);