Add an access control module
The module's purpose is to check access requirements,
(such as being logged in), and raise an exception
containing a authentication request when the requirement
is not met.
Patch by: Sverre Rabbelier
Reviewed by: Pawel Solyga, Augie Fackler, Todd Larsen
Reviewed at: http://codereviews.googleopensourceprograms.com/1601
Review id: 1601
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