WIP snapshot (renamed: open_client => connect_rpc; start_server => serve_rpc)
a bit of progress
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
basic pipeline implementation (without tests)
simple pipeline test added
rpc examples fixed
rpc docs updated: renames start_server => serve_rpc; open_client => connect_rpc
tests for aiozmq.rpc.pipeline
msgpack version check added
basic pubsub implementation
typo fixed
typo fixed
PubSub service implemented + test
more pubsub tests
Merge branch 'rpc_module_to_package'

Conflicts:
	aiozmq/rpc/rpc.py
	docs/rpc.rst
	examples/rpc_custom_translator.py
	examples/simple_rpc.py
	tests/rpc_func_annotations.py