add avro schema to support other languages

Add [Apache Avro](http://avro.apache.org/) protocol schema for other [Supported Languages](https://cwiki.apache.org/confluence/display/AVRO/Supported+Languages).It was only a partial modification to the attempt. Not centain if such avro schema can fit this project.

```
$ nosetests test/test_avroproto.py
....
----------------------------------------------------------------------
Ran 4 tests in 0.002s

OK
```
@y12studio: From the testsuite run and the repository of `avro_json_serializer`, it appears the only thing [imported](https://github.com/linkedin/python-avro-json-serializer/blob/master/avro_json_serializer/__init__.py#L26) from `simplejson` is the [OrderedDict](https://docs.python.org/2/library/collections.html#collections.OrderedDict) class, which is part of the Standard Library since Python 2.7.

I guess this is too new for some people, so just leave `simplejson` there for now. I 'll try to make an upstream patch. Thank you for your patience.