Workitem #wf_name and #wf_revision

with #definition_name and #definition_revision aliases
RevParticipant initial implementation
register block : catchall and catch_all
improved conditional eval for dollar notation
credits update
fixed issue with deep set and unset

(Thanks Nando Sola)
mostly complete RevParticipant impl

Next steps : think about => and ~> ... The resolution scheme now is place is very absolute...
precising things in a comment
register block : now clearing by default
register_participant : after/before/over
register block : issue with lonely regex and block

fixed.
plist, multiple participants, same regex, ok

participant list, allowing multiple participants with the same regex.
Allows for cascading participants (at consume and at on_error).

This commit doesn't cover the change itself, but just adds a ft_5_on_error test for it and on_error.
ft_0 : adaptation for the latest ruote-redis
gemspec simplification
commenting out a debugging leftover
initial pause/resume implementation
RevParticipant rdoc
Participant #on_pause and #on_resume

propagation of the pause/resume messages to the participants
changelog and pause/resume

oops
save :to => 'f:a' / :to => 'v:b'