Update README to document --pool-size parameter to wal_push

Editorialized by Daniel Farina <daniel@fdr.io>
Add Joshua Gross as a contributor
Remove extra typoed period
Merge pull request #66 from brosner/add-endpoint-type

added support for swift endpoint_type
Added Brian Rosner to the CONTRIBUTORS file
Corrected an inaccurate log message that resulted from a copy-paste.
Fixed the delete command with 'before' on Swift by using the portable API for getting a container from a key
Adhere to coding convention as enforced by tests
Using streaming uploads and download with Swift.

Previous it read entire files and HTTP responses into memory before uploading
or writing them to disk, respectively. Now we read/write in chunks.
Simplify and adjust logging setup

Notably, logging will be set up and sent to stderr regardless of
keyword arguments to configure (that flexibility was never used
anyway) and does not depend if root handlers have already been
registered or not.

Prompted after seeing some of the gratuitous difficulty in debugging
for some people due to lack of output, attempt to streamline and
simplify the logging setup procedure.

There may be a loss here to how well WAL-E composes with other
applications were it used as a library, but there are no such users
known to date nor have they complained, so adjust the trade-off in
favor of a higher chance of getting diagnostics for WAL-E users and
hackers.
Provide nicer logging on non-existant files in the Swift backend.

This now works the same as the S3 backend.
Merge remote-tracking branch 'upstream/master' into eldarion