add lc_daemon.py dirnode.py. add simple sysfs code to dm-lc.c
remove filter.rb
fixed filter_log.py
add allow_migrate on sysfs
modified README
add sysfs(commit_super_block, flush_current_buffer).  modify README
impl device sysfs
enhances sysfs
modified README
add update_interval
Merge branch 'topic/37_periodical_sb_commit' into v1-devel