Added missing workflow writer elimination of traits_version

Added more logging

Removed __traits_version__ from model getstate

Added indentation to json output for better readability

Removes the __traits_version__ when dumping the state with __getstate__()

Introduced log file option

Bumping version to 0.2.0.dev0

Added installation instructions

Introduced interface for FactoryRegistryPlugin

Release 0.1.0

Removed ZMQ toy server used for initial experimentation

Create probe classes for tests