Release 0.2.1 - Squashed commit of the following:

commit 379801556e3d25565819857a9934b214fae91b2a
Author: Mike Hayman <mikehayman@gmail.com>
Date:   Mon Aug 19 22:49:14 2013 -0400

    Bumping version number to 0.2.1

commit 0326b1ab5ce93c0acda37325af31c7cc632424e6
Author: Mike Hayman <mikehayman@gmail.com>
Date:   Mon Aug 19 22:38:14 2013 -0400

    removed old autoloader files

commit 805ea766db9994cf4b464b7809ec212e1fdb0729
Author: Mike Hayman <mikehayman@gmail.com>
Date:   Mon Aug 19 22:35:56 2013 -0400

    updating phpunit.xml to use composer autoloader

commit e18dd53f5ce9a2674b13b930f2f926a8b15b84de
Author: Mike Hayman <mikehayman@gmail.com>
Date:   Mon Aug 19 22:20:46 2013 -0400

    Resolving GL Issue #8 - handling boolean values for config keys

    Also modified the behavior of ConfigContainer to no longer throw exceptions
    when a key does not exist.  Behavior is now to return null.