added clear() method to the input class

Signed-off-by: Dayle Rees <thepunkfan@gmail.com>

laravel/documentation/input.md

@@ -146,3 +146,9 @@ Sometimes you may wish to merge or replace the current input. Here's how:
 #### Replacing the entire input array with new data:
 
 	Input::merge(array('doctor' => 'Bones', 'captain' => 'Kirk'));
+
+## Clearing Input
+
+To clear all input data for the current request, using the `clear()` method, for example:
+
+	Input::clear();
\ No newline at end of file

laravel/input.php

@@ -287,4 +287,13 @@ class Input {
 		Request::foundation()->request->replace($input);
 	}
 
+	/**
+	 * Clear the input for the current request.
+	 * @return void
+	 */
+	public static function clear()
+	{
+		Request::foundation()->request->replace(array());
+	}
+
 }
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