version 0.12.1, 2012-06-23:
  * implemented fix for obscure ambiguity in tmux new-window command

version 0.12.0, 2012-06-13:
  * implemented ArkUtil::Tmux, a class for controlling tmux from a script

version 0.11.1, 2012-06-05:
  * Fixed ArkUtil::process_monitor_spec_options ignore disabled monitors

version 0.11.0, 2012-06-01:
  * implemented ArkUtil::Rsync, a class for executing rsync commands in
    parallel with timeouts and retries
  * changed ArkUtil::process_monitor_spec_options to handle --not,
    --with-ipv6, --activity, --feature, --list-features, and --list-activities;
    shortened --monitor-attribute to --attribute and --monitor-value to --value

version 0.10.10, 2012-04-10:
  * implemented workaround for Ruby 1.9.3 missing YAML::each_document
    (which is used in monitorutils.rb:ArkUtil::load_monitor_spec_file())

version 0.10.9, 2012-03-13:
  * changed ArkUtil::os_type to handle FreeBSD 7.4 and future 7.x

version 0.10.8, 2010-08-09:
  * improved sleep_at_least() to reduce the amount of time slept beyond the
    requested amount (on some systems, sleep_at_least() could sleep 1.5 s
    beyond requested in some cases, even though Ruby may support sleeping
    with a precision of a few ms on the same system)
  * added support for FreeBSD 7.3 to ArkUtil::os_type()

version 0.10.7, 2010-02-23:
  * added handling of EOFError, IOError, and Net::SSH::Exception to
    TimedSFTP#get_file

version 0.10.6, 2010-02-12:
  * added --list-monitors, --monitor-attribute, and --monitor-value to
    monitorutils.rb

version 0.10.5, 2010-01-06:
  * now uses ARKUTIL_SPEC_PATH env variable, if available, to find the path
    of monitors.yaml in monitorutils

version 0.10.4, 2009-12-16:
  * added support for FreeBSD 7.2 to ArkUtil.os_type()

version 0.10.3, 2009-11-18:
  * changed ArkUtil::List#find_all_nodes, #find_node, and #delete_if
    to guarantee calling the user-provided block for each node in
    order and only once

version 0.10.2, 2009-10-13:
  * updated TimedSFTP to deal with non-backwards compatibility in newer net-sftp

version 0.10.1, 2009-06-18:
  * disable Nagle algorithm in ScamperIO and ScamperControl

version 0.10.0, 2009-06-12:
  * added upload_file and download_file
  * added arkutil/management.rb containing misc methos for managing Ark
    remote processes

version 0.9.0, 2009-05-05:
  * added ArkUtil::Queue, a replacement for the standard library Queue
    that uses ArkUtil::List instead of an Array for better scalability and
    to prevent memory leaks
  * improved ScamperDataFeed to more efficiently handle a large number of
    queued up client requests (now uses ArkUtil::Queue & List)

version 0.8.3, 2009-04-08:
  * Ruby 1.9 compatibility
  * removed dependence of arkutil/numericutils on arkutil/generalutils

version 0.8.2, 2009-04-03:
  * fixed bug in ArkUtil::ScamperIO#read_data that would cause an
    uncaught exception in some rare cases
  * added arkutil/list.rb and removed dependence on marinda/list.rb in
    arkutil/scamperio.rb; ArkUtil should be entirely self-contained now

version 0.8.1, 2009-03-18:
  * fixed race condition in ArkUtil.release_exclusive_lock
  * implemented ScamperDataFeed#execute_raw_command, which allows client
    to execute any arbitrary scamper command

version 0.8.0, 2008-12-10:
  * added ip6utils.rb: IPv6 address utilities
  * added ArkUtil::shuffle_array.

version 0.7.0, 2008-11-06:
  * added todutils.rb, which is useful for working with the topo-on-demand
    service

version 0.6.0, 2008-10-08:
  * added ScamperDataFeed and ScamperIO classes for interacting with
    scamper over scamper's control socket; ScamperDataFeed allows you to
    issue traceroute and ping commands and to retrieve measurement results
    over the control socket
  * added support for debugging net-sftp in TimedSFTP

version 0.5.1, 2008-07-22:
  * fixed TimedSFTP to retry after getting an Errno::ECONNRESET or similar
    exception while downloading (TimedSFTP already retries for a lot of
    errors, but there was a lack of coverage of this exception in one part
    of the code)

version 0.5.0, 2008-07-11:
  * removed ArkUtil::*Utils classes; moved their enclosed methods into ArkUtil
  * added sshutils.rb and monitorutils.rb
  * added methods to compute SHA1 and MD5 hashes of files

version 0.4.0, 2008-07-10:
  * added generalutils.rb, interactiveutils.rb, and numericutils.rb

version 0.3.0, 2008-07-07:
  * updated to use Net::SFTP v2.0.0 (v1.x is no longer supported)

version 0.2.0, 2007-11-28:
  * added fileutils.rb and processutils.rb
  * added GPLv2+ header to files