Remove URI filter for parenthesis and dollar symbols, as talked in bc…

…it-ci#47.

Signed-off-by: Razican <admin@razican.com>

system/core/URI.php

@@ -326,13 +326,6 @@ public function filter_uri($str)
 		{
 			show_error('The URI you submitted has disallowed characters.', 400);
 		}
-
-		// Convert programatic characters to entities and return
-		return str_replace(
-			array('$',     '(',     ')',     '%28',   '%29'),	// Bad
-			array('$', '(', ')', '(', ')'),	// Good
-			$str
-		);
 	}
 
 	// --------------------------------------------------------------------