Update messages, comments and documentation for materialized views.

Noah Misch <noah@leadboat.com>

Commit: 02d2b694ee42a9e241d37ce67df122fff43d5bb9
Author: Noah Misch <noah@leadboat.com>
Date: 2013-07-05T19:37:51Z
Releases: 9.4.0
Update messages, comments and documentation for materialized views.

All instances of the verbiage lagging the code.  Back-patch to 9.3,
where materialized views were introduced.

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