Adding methods for reverse migrations

.gitignore

@@ -2,3 +2,5 @@
 .DS_Store
 .*.sw?
 .idea
+/nbproject/private/
+nbproject/

src/Firebird/Query/Processors/FirebirdProcessor.php

@@ -4,4 +4,18 @@
 
 class FirebirdProcessor extends Processor {
 
+    /**
+     * Process the results of a column listing query.
+     *
+     * @param  array  $results
+     * @return array
+     */
+    public function processColumnListing($results) {
+        array_walk($results, function(&$object) {
+            $array = (array) $object;
+            $object = trim($array['RDB$FIELD_NAME']);
+        });
+        return $results;
+    }
+
 }

src/Firebird/Schema/Grammars/FirebirdGrammar.php

@@ -31,7 +31,16 @@ public function compileTableExists()
     return "SELECT RDB\$RELATION_NAME FROM RDB\$RELATIONS WHERE RDB\$RELATION_NAME = ?";
   }
 
-  /**
+    /**
+     * Compile the query to determine the list of columns.
+     *
+     * @return string
+     */
+    public function compileColumnListing($table) {
+	return "SELECT RDB\$FIELD_NAME FROM RDB\$RELATION_FIELDS WHERE RDB\$RELATION_NAME = '$table'";
+    }
+
+    /**
    * Compile a create table command.
    *
    * @param  \Illuminate\Database\Schema\Blueprint  $blueprint