fix parameter registration for sparse feature matrix
fix parameter registration for sparse feature matrix

lambday/shogun,lisitsyn/shogun,geektoni/shogun,lisitsyn/shogun,besser82/shogun,geektoni/shogun,karlnapf/shogun,karlnapf/shogun,besser82/shogun,geektoni/shogun,geektoni/shogun,lisitsyn/shogun,lisitsyn/shogun,shogun-toolbox/shogun,karlnapf/shogun,shogun-toolbox/shogun,shogun-toolbox/shogun,besser82/shogun,lambday/shogun,lambday/shogun,shogun-toolbox/shogun,besser82/shogun,geektoni/shogun,geektoni/shogun,lisitsyn/shogun,lambday/shogun,lambday/shogun,besser82/shogun,lambday/shogun,besser82/shogun,lisitsyn/shogun,shogun-toolbox/shogun,shogun-toolbox/shogun,karlnapf/shogun,karlnapf/shogun,karlnapf/shogun