Update User Manual

[ghrab]

I've tried to follow the User Manual as mentioned on your ReadMe: http://research.microsoft.com/pubs/259290/GraphView%20User%20Manual.pdf
I found some issues with the documentation.
For example to delete nodes, we should use: gdb.DropNodeTable("DROP TABLE EmployeeN");
Instead of: gdb.CreateNodeTable("DROP TABLE EmployeeNode");

For the query creating the table EmployeeNode, I think an "@" is missing at beginning of the query.
I wish if you could revise and update the docs as it will accelerate the adoption of the project.

Thanks !