Log Message:
Update to 0.29

Upstream changes:
0.29    2014/07/17 12:18:12
        [CHANGES]
         * Added Test::Future
         * Stronger deprecations - repeat {} on failures warns every time,
           ->and_then / ->or_else warn once

        [BUGFIXES]
         * Define the behaviour of dependent futures when components are
           cancelled. (Partially fixes RT96685)
         * Use Module::Build->prompt (RT96409)
         * Ensure that repeat on an empty foreach list or empty generator
           without 'otherwise' behaves correctly, just yield an immediate

0.28    2014/06/08 22:43:40
        [CHANGES]
         * Added ->label
         * Added ->btime, rtime, elapsed tracing timers
         * Better handling of 'breaks' version detection

0.27    2014/06/06 17:42:27
        [BUGFIXES]
         * Depend on Carp 1.25 for the new message format with trailing
           period, so tests work

0.26    2014/06/01 12:52:53
        [CHANGES]
         * Added ->is_failed accessor
         * Implement ->export_to_level in Future::Utils
         * Print a warning about lost sequence Futures
         * Allow Future->done and Future->fail as simple class constructors
           to return immediates
         * Added Future->unwrap

        [BUGFIXES]
         * Ensure that sequence futures are weaken()ed in the forward
           direction.
           **NOTE** This will potentially break existing code that depended on
             strong references. This old code was, however, broken.