RPC::Framework::Distributor: code style fix
RPC::Server::Dispatcher#dispatch: Fixed spec expectations
RPC::Server::Spider: spec cleanup
RPC::Server::Framework, RPC::Server::Instance: fixed cleanup race condition
RPC::Framework::Distributor spec: Tiny cleanup
Processes::Manager#discard_output: Updated to discard output again.
Reverted arachni-rpc-em to v0.1.3