uniq tags when requesting from arcd
rename var
fix bug: subscriber sees writes outside of subscribed subspaces
comment about deep freeze
release 0.11

* fix bug: subscriber sees writes outside of subscribed subspaces

* client can be initialized with tuplespace class with arguments
* allow single string as initial subscription
* safe to call use_subspaces more than once
* check for errors in subscription spec

* tup utility can enable subspaces and subscribe to tags
* multi-tier examples
* pubsub example using subspaces