Fixed make_re_near_word() and make_near_index_base() for speed up

Signed-off-by: Masami HIRATA <msmhrt@gmail.com>
Refactored KanayureChecker class for speed up

Signed-off-by: Masami HIRATA <msmhrt@gmail.com>
Use defaultdict

Signed-off-by: Masami HIRATA <msmhrt@gmail.com>