v0.1.9

• Added the ability to specify an external logger.
• Added state which properly handles multiple calls to Run.
• Added ProxyLogger which is passed to the underlying proxy implementation (GoProxy) to format its message accordingly to Forwarder logger format.
• Proper handles cases where Run may be called without proxy being setup.
• Covered all changes with tests.
• Upgraded to Sypl v1.5.5