Replaced .gitignore with a previous version. 
It has to allow to ignore everything except itself.
We don't want binary files on the repository.
useless @rule line deleted
Javadoc of metadata
Solap4py-java now interact with Solap4py with bytes array.
String conversion from Java to Python is extremely long. 
This way, we can send strings more efficiently.
replaced py4j with java sockets
Merge pull request #8 from Westpic/develop

Communication problem correction (task n°1 & 2)