Remove the Psysh Dependency

Now requires CakePHP Dependency v3.3
Updates the cache-clear script to use the native CakePHP cache clear shell

Signed-off-by: Justin Yost <justin@loadsys.com>

Author: justinyost

cache-clear

@@ -28,11 +28,4 @@ fi
 
 echo "## Clearing cache folders.";
 
-cat <<-'EOPHP' | bin/cake console -q | head -n -1
-	foreach (\Cake\Cache\Cache::configured() as $key) {
-		\Cake\Cache\Cache::clear(false, $key);
-		echo "  - Cleared: $key\n";
-	}
-	exit;
-
-EOPHP
+bin/cake cache clear_all

composer.json

@@ -9,9 +9,9 @@
         }
     ],
     "require": {
+        "cakephp/cakephp": "~3.3",
         "phpunit/phpunit": "~4.1",
         "phpdocumentor/phpdocumentor": "~2.0",
-        "psy/psysh": "@stable",
         "loadsys/loadsys_codesniffer": "~3.0",
         "nikic/php-parser": "~0.9",
         "phpmetrics/phpmetrics": "^1.10"