[release] RRRSpec v0.2.1

= server

- ActiveRecord has updated to ~> 4.0.2
- logs are now stored as file
  - DB has length limit...
  - be careful to inode limit
- Support facter 2

= web

- API v2
  - now rrrspec-api requests trial, worker and slave logs based on user's
    request

= client

- fixed a bug where raise ArgumentError when searching configuration file
  - this had caused when process' user doesn't have home directory