Namespaces/Multitenancy issue and fix

[pbridger]

The local_env_helper ApiProxy proxy creates a new, empty HashMap every time getAttributes is called. Since namespace is kept in here, it will never be set persistently.

(getAttributes )

I just created an environment-attributes atom, return it from getAttributes, clear it in the environment clearing function. Works okay so far.

[gcv]

Seems like a pretty good idea. I'll incorporate this into the next version (which I do intend to get to sometime soon!).