Configuration.md: format for editor readability

Most lines are now limited to 79 characters. This makes the document
much easier to read in a mortal text editor.
Configuration.md: make hyperlink relative

It was pointing to a specific branch, which isn't even the "main" dev
branch anymore.
Configuration.md: add more detail to pipeline conf

1) The suggested names for zerocloud middleware filters now are prefixed
with "zerocloud-", for disambiguation.
2) There are now detailed instructions for where the zerocloud filters
need to be placed in the "pipeline:main" configuration.
Configuration.md: add job chain config doc
Merge pull request #173 from larsbutler/update-configuration-doc

Update configuration documentation
acls
proxyquery: add a bunch job authorization comments
test_proxyquery: clean up bad imports in test apps
test_proxyquery: fix test breakage from a rebase
proxyquery: fix the sequence of path_info change

The refactoring of post_job and some rebases put a req.path_info value
change out of order, and some tests were breaking. All tests pass now.
proxyquery: fix source handling for api chain
proxyquery: fix spurious auth errors on cont. list

An authorization error (presented to the client as a 400 bad request) is
raise in some cases when container listing is done in a chain. A
concrete example:

An api/1.0 application spawns a chained job which does a mapreduce job,
operating a container glob. The glob causes a container listing to be
done, and this is where the authorization fails (if the user is, for
example, anonymous and executing under setuid permission).
configparser: fix a single file glob parsing

This was causing map/reduce jobs to fail, where a `input` glob was
matching only a single file.
README: Fix build status URL
Merge pull request #176 from larsbutler/README-fix-build-status

README: Fix build status URL
vagrant: add more reasonable mem/cpu config
Merge pull request #177 from larsbutler/vagrant-cpu-mem

vagrant: add more reasonable mem/cpu config
Merge pull request #172 from larsbutler/acl-rebased

ACL branch, rebased (WIP)