refactor:delete unused methods
add safecopy mode
Merge branch 'master' of git@github.com:roma/roma into safe_copy
add test for safecopy
add command of strage status
add method for cachecleaning
add command process for safecopy
Add status log
Add check and open cache in opendb
Add storage backup command
add test code for the safecopy
bugfix : for the RubyHashStorageTest
add safecopy test for rbalse, join, recove in multi server
modify check script
modify script2
change test name
add sleep for test without snapshot process (basically comment out)
Merge branch 'safe_copy' into test

Conflicts:
	ruby/server/lib/roma/async_process.rb
	ruby/server/lib/roma/command/sys_command_receiver.rb
change class variable to instance variable (safecopy_test)
Merge pull request #19 from hiroaki-iwase/test

for release 0.8.14