add glossary of terms to documentation

[Doug Hellmann]

See https://lists.launchpad.net/openstack/msg17643.html for a few of the terms we need to define.

[Anne Gentle (annegentle)]

Definitions for "resources" would be useful in the docs.openstack.org glossary as well if you want.

doc/src/docbkx/common/glossary in the openstack-manuals repository

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/22469

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/22651

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/22651
Committed: http://github.com/openstack/ceilometer/commit/a63622a5334b0c620ffaaca0126d8caf8f34e20b
Submitter: Jenkins
Branch: master

commit a63622a5334b0c620ffaaca0126d8caf8f34e20b
Author: Dan Florea <email address hidden>
Date: Thu Feb 21 02:20:23 2013 -0800

    Add glossary definitions for additional terms

    Add glossary definitions for the following: meter, project, resource, sample, source, user.

    Fixes bug 1070382

    Change-Id: I56120cafcdb6faa160724e7774c6e54a25e1bf43