Fix a bug related to attaching ExceptionProxy objects when they arrive at the client
Remove IsolationContext.restart because it is confusing to restart a context yet have all the existing referencs be invalid. Better to just create a new IsolationContext.
Add an optional "path" argument to import_isolated and load_module
Update some comments and exception messages
Add a unittest that imports "sqlite3" within an isolated module
fix pypi script
Add much documentation to README.md
update TODO