Alphabetized items under other sections in source documentation

I alphabetized the items under "Proxy", "Account", "Container",
and "Object" in the source documentation to make them easier to
locate.

Change-Id: Ia9cca0ee558cb1e0361c1a88103352bd006da1e3
Refactor a quorum-size calculation

No behavior change, just use the utility function instead of rolling
our own.

Change-Id: I152ccd8f22f424cd7547fa4d67df020f263096a9
AUTHORS and CHANGELOG update for 1.13 release

Change-Id: I6195c70cbbd7c94682539962dd5410e3665f01ac
Merge "Refactor a quorum-size calculation"
Merge "AUTHORS and CHANGELOG update for 1.13 release"
Merge "Alphabetized items under other sections in source documentation"