[zhanfeiXiao]have not set isolate in create_model initial_models.rb
add new branch
[zhanfeiXiao]add isolate to db as column in node_descriptor table
[zhanfeiXiao]Add isolate to node_descriptor
quick fix rspec not found
Merge pull request #16 from winsonwq/use_no_sql_db

Notice this is not using NoSql actually, just using namespace