Move configs used in unit tests to cfg/ dir

Makes it easier to track the various configs used in tests.
Change profile section names in aws config file

Profile names are now specified as::

    [profile "name"]
    aws_... = foo

The motivation for this change is to "make room" for other
configuration options in the config file.  Currently, any section
name in the config file is considered a potential profile name.

Another alternative is to just whitelist a set of configuration
options that aren't profiles, but then that restricts what names
you can use for profiles.
Merge branch 'profile-config' into develop

Closes #40

* profile-config:
  Change profile section names in aws config file
  Move configs used in unit tests to cfg/ dir