no warnings for tube.py
no warnings for _components.py
enough docstrings for fan.py to make twistedchecker happy
warnings for memory
lines too long
twistedchecker clean for test_tube
use absolute latest twistedchecker
enough docstrings to pacify twistedchecker

most of them at least somewhat useful.
spellcheck dependency
spelling fixes
ignore build dirs
Merge pull request #12 from twisted/tcheckit

make the CI infrastructure turn green so pull requests can be evaluated more easily