* Write more tests
  * Some parts of app.py aren't tested
  * Some parts of mktap might be able to be tested
  * twistd/twistw would be nice to test, maybe by explicitly
    running a new process
* Doc-strings
  * app.py
  * mktap.py
  * tapconvert.py
  * twistd.py
  * twistw.py
* Improve twistw -- add service registration/running abilities
* Manual
  * What is Service and ServiceCollection
    * Writing new services
  * What Application is
  * Running network servers and clients
  * Writing .tac files
  * Writing tap plugins
