JSON-Datetime 0.0.1

# JSON-datetime
JSON-datetime allows for proper decoding of datetime values contained in JSON
streams.

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## The problem
The JSON standard ([RFC 4627](http://www.ietf.org/rfc/rfc4627.txt)) does not
support datetime types. These are usually represented as strings and Python
decoders end up decoding them as such. Consider the following example:
```python
import simplejson as json

>>> test = '{"name": "John Doe", "born": "Thu, 1 Mar 2012 10:00:49 UTC"}'
>>> json.loads(test)
{'name': 'John Doe', 'born': 'Thu, 1 Mar 2012 10:00:49 UTC'}
```
As you can see, in the resulting dictionary `born` is still a string.

## The solution
JSON-datetime is a very simple wrapper around Python
[simplejson](http://simplejson.readthedocs.org/en/latest/index.html#) `loads`
method. It decodes datetime values contained in JSON strings:

```python
import jsondatetime as json

>>> test = '{"name": "John Doe", "born": "Thu, 1 Mar 2012 10:00:49 UTC"}'
>>> json.loads(test)
{'name': 'John Doe', 'born': datetime.datetime(2012, 3, 1, 10, 0 ,49)}
```
Strings must match a valid `strptime()` datetime format in order to be decoded
to datetime values. In the example above since the optional `datetime_format`
argument is missing, the default RFC1123 format (`'%a, %d %b %Y
%H:%M:%S UTC'`) is used. In the following example we are using a custom format:
```python
import jsondatetime as json

>>> test = '{"name": "John Doe", "born": "Thu, 1 Mar 2012"}'
>>> json.loads(test, datetime_format="%a, %d %b %Y")
{'name': 'John Doe', 'born': datetime.datetime(2012, 3, 1)}
```

## Custom parsing
Being just a wrapper around the `loads` method, you can still use all the standard
`loads` arguments, `object_hook` included. This means that you can still
perform custom parsing of your inbound JSON stream.