**DO NOT ADD a __init__.py file in this directory**
"Why not?" you ask; read on!
1. If we're running asyncio tests, we can't ever call txaio.use_twisted()
2. If we're running twisted tests, we can't ever call txaio.use_asycnio()...
3. ...and these are decided/called at import time
4. so: we can't *import* any of the autobahn.asyncio.* modules if we're
running twisted tests (or vice versa)
5. ...but test-runners (py.test and trial) import things automagically
(to "discover" tests)
6. We use py.test to run asyncio tests; see "setup.cfg" where we tell
it "norecursedirs = autobahn/twisted/*" so it doesn't ipmort twisted
stuff (and hence call txaio.use_twisted())
7. We use trial to run twisted tests; the lack of __init__ in here
stops it from trying to import this (and hence the parent
package). (The only files matching test_*.py are in this
directory.)
*Therefore*, we don't put a __init__ file in this directory.
