[WIP] 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  YES. It works after applying the patch.
```
--- a/requirements.txt
+++ b/requirements.txt
@@ -21,5 +21,4 @@ websocket-client==0.16.0
 wsgiref==0.1.2
 zope.interface==4.1.1
 avro==1.7.7
-avro_json_serializer==0.4
-simplejson==3.6.3
+avro_json_serializer==0.4.1
```