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
```
@renelvon Great to see pylint getting incorporated.

On Fri, Sep 19, 2014 at 5:59 AM, Y12STUDIO <notifications@github.com> wrote:

> In requirements.txt:
>
> > @@ -20,3 +20,6 @@ tornado==4.0.1
> >  websocket-client==0.16.0
> >  wsgiref==0.1.2
> >  zope.interface==4.1.1
> > +avro==1.7.7
> > +simplejson==3.6.3
>
> sorry, I am mistaken, simplejson is required in avro_json_serializer.
>
> nosetests
> E..............................E
> ======================================================================
> ERROR: Failure: ImportError (No module named simplejson.ordered_dict)
> ----------------------------------------------------------------------
> Traceback (most recent call last):
>   File "/home/travis/virtualenv/python2.7.8/lib/python2.7/site-packages/nose/loader.py", line 414, in loadTestsFromName
>     addr.filename, addr.module)
>   File "/home/travis/virtualenv/python2.7.8/lib/python2.7/site-packages/nose/importer.py", line 47, in importFromPath
>     return self.importFromDir(dir_path, fqname)
>   File "/home/travis/virtualenv/python2.7.8/lib/python2.7/site-packages/nose/importer.py", line 94, in importFromDir
>     mod = load_module(part_fqname, fh, filename, desc)
>   File "/home/travis/build/OpenBazaar/OpenBazaar/test/test_avroproto.py", line 5, in <module>
>     from node.avroproto import avroproto
>   File "/home/travis/build/OpenBazaar/OpenBazaar/node/avroproto.py", line 4, in <module>
>     from avro_json_serializer import AvroJsonSerializer
>   File "/home/travis/virtualenv/python2.7.8/lib/python2.7/site-packages/avro_json_serializer/__init__.py", line 26, in <module>
>     from simplejson.ordered_dict import OrderedDict
> ImportError: No module named simplejson.ordered_dict
>
> —
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> <https://github.com/OpenBazaar/OpenBazaar/pull/541/files#r17767224>.
>