Fixed bug with account_info

There was a bug where account_info wasn't converting the
container_count value to an int. Causes max container count cap to
get hit pretty quick since '0' > 0.

Change-Id: Ibfc6eebbff5a00aaebb47e9731dd053b60e3caa4
Add missing CONTRIBUTING.md to source tarball

Fixes MANIFEST.in to include missing CONTRIBUTING.md into source
code tarballs.

Change-Id: I81876adad14e0f1b2211d39ec6471e35f5464120
Add a region tier to Swift's ring.

The region is one level above the zone; it is intended to represent a
chunk of machines that is distant from others with respect to
bandwidth and latency.

Old rings will default to having all their devices in region 1. Since
everything is in the same region by default, the ring builder will
simply distribute across zones as it did before, so your partition
assignment won't move because of this change. If you start adding
devices in other regions, of course, the assignment will change to
take that into account.

swift-ring-builder still accepts the same syntax as before, but will
default added devices to region 1 if no region is specified.

Examples:

$ swift-ring-builder foo.builder add r2z1-1.2.3.4:555/sda

$ swift-ring-builder foo.builder add r1z3-1.2.3.4:555/sda

$ swift-ring-builder foo.builder add z3-1.2.3.4:555/sda

Also, some updates to ring-overview doc.

Change-Id: Ifefbb839cdcf033e6c9201fadca95224c7303a29
Fix swift-ring-builder's list_parts command.

I broke it in 7548cb9 when a ring's replica count changed from an int
to a float.

Change-Id: I49fa7e2961a09daad0c96e19cf1e39fec248d998
Remove check for valid Origin for the "actual request".

The only place in the spec that I could see the Origin being checked was
during the pre-flight OPTIONS request. If it gets to the actual request
let auth decide. Please correct me if this is wrong.

Change-Id: Ic31b71746ec056091c7778ebff3db7becc32bd9c
Merge "Fix swift-ring-builder's list_parts command."
Merge "Add missing CONTRIBUTING.md to source tarball"
Merge "Remove check for valid Origin for the "actual request"."