Add examples for deploying using Swift
Add Christopher Weibel as a Contributor
Use s3-external-1 endpoint for us-standard

This is the endpoint in us-east-1, where most instances are.  This is
not being applied to the v0.6 maintenance releases to avoid changing
behavior for those who are closer to Seattle.
Elide other backends besides S3 in requirements.txt

It's not clear how to make things cleanly optional but not a usability
nightmare (e.g. installing *no* backends by default for 'pip install'
based people) within the Python packaging framework, so don't try..for
now.
Use a drastically larger write size for pipes

The intent is to reduce the number of system calls required by WAL-E.
This change may now be possible because the removal of bogus code that
previously caused deadlocks unless writes were small enough to be
atomic.