Activity Streams URI Namespace

The First Public Working Draft *should* publish today. Looking forward to
next steps, we need to decide on the official Namespace URI that we'll be
using. To this point we've been using http://activitystrea.ms/2.0/, which
is not a W3C controlled domain.

For the Activity and Actions vocabulary, what I propose is using:

  http://www.w3.org/2014/activitystreams#

Then for any legacy AS1 terms, we would either keep using

  http://activitystrea.ms/1.0/ (to highlight the fact that these older
terms are not officially endorsed/specified by the Working Group) or do:

  http://www.w3.org/2011/activitystreams# (to highlight the year that
Activity Streams 1.0 was published)

- James