Layeredconfig

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* Fixed bug 9 (Custom section separators caused values to be
retrieved as lists, not single values). Thanks to numbnut for
reporting this!

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* Fixed bug 8 (layering a Commandline source over a YAMLFile with
defined subsection resulted in crash in initialization. Thanks to
AnsonT for reporting this!
* The default URI used for EtcdStore was changed to reflect that port
2379 should be used instead of 4001 (which was the default for etcd
1.*).
* Support for Python 3.2 was dropped.

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* New staticmethod ``dump``, which returns the content of the passed
config object as a dict. This is also used as a printable
representation of a config object (through ``__repr__``).
* The intrinsic type of any typed setting may not be None any longer.
* If you subclass LayeredConfig, any created subsection will be
instances of your subclass, not the base LayeredConfig class
* Layering multiple configuration files now works even when earlier
files might lack subsections present in latter.

All of the above was done by jedipi. Many thanks!

A number of unreported bugs, mostly concerning unicode handling and
type conversion in various sources, was also fixed.

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* Fixed a bug when using a class in a Default configuration for
automatic coercion, where the type of the class isn't type (as is
the case with the "newint" and other classes from the future
module).

* Fixed a bug where loading configuration from multiple config files
would crash if latter configs lacked subsections present in
earlier. Thanks to badkapitan!

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* Made the Commandline source interact better with "partially
configured" ArgumentParser objects (parsers that has been configured
with some, but not all, possible arguments).

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* Integration with argparse: The Commandline source now accepts an
optional parse parameter, which should be a configured
argparse.ArgumentParser object. Most features of argparse, such as
specifying the type of arguments, and automatic help text
* A new source, PyFile, for reading configuration from python source
files.
* Another new source, EtcdStore, for reading configuration from etcd
stores.