1. Renamed GetResponse to Query in DGraph service.
2. Client now accepts the ip of the server as a flag instead of just the port.
3. Removed ToProtocolBuffer method, and added PreTraverse as a method for a Subgraph.
4. Renamed runServerForClient to runGrpcServer.

Also query is now input as a flag in the client

Client now gets back protocol buffer data and is able to parse it into protocol buffer Subgraph

Client establishes a TCP connection with server. Sends a sample query and parses response.
Server listens to client, handles the query and sends back response.

1. Added subgraph.proto file which has the message structure.
2. Added ToProtocolBuffer method which converts a subgraph to protocol buffer.

Change key formation, code to get list of predicates in a given store

Performance improvements and bug fixes

Handle language when forming NQuad. Move the fp mod earlier in the process, to avoid paying for ToEdge() function call.

Aync writes to RocksDB are 1000x faster than sync writes. We don't need to do synchronous writes because we do sync writes on commit logs