Rename _RPCServer to Service, document it and add .transport property
Improve the docs
Reflow rpc sections
Document rpc value translators
Rename translators to translation_table
Fix typo in docs
Work on the docs
Fix docs
pipeline & pubsub stubs added
Merge branch 'master' into rpc_module_to_package

Conflicts:
	aiozmq/rpc/rpc.py
	tests/rpc_translators_test.py
rpc package structure refactored