simple tasks of README markdown conversion are added to Rakefile.
updated README. new section titles.
updated README. Server Configuration section.
updated README. Config.yml Parameters section. base_dir parameter.
reordered command functions.
defined command option utility. and modified imap-append command.
defined command option utility. and mbox-dirty-flag command is modified.
refactored show-user-mbox command.
defined command option utility. and debug-dump-kvs command is modified.
updated README. Config.yml Parameters section. logging parameter.
updated README. Config.yml Parameters section. key-value store parameter.
updated README. Config.yml Parameters section. hostname parameter.
updated README. Config.yml Parameters section. username and password parameter.
updated README. Config.yml Parameters section. user_list parameter.
updated README. Config.yml Parameters section. ip_addr and ip_port parameter.
updated README. Mailbox Data section.
updated README. Mailbox Data section. Message key-value store subsection.
updated README. Mailbox Data section. Meta key-value store subsection.
updated README. Mailbox Data section. Mailbox key-value store subsection.
Merge branch 'cmd'