Simple spelling corrections
Merge pull request #1141 from JohnLZeller/patch-1

Simple spelling corrections
Accept sqlalchemy-migrate versions 0.8 and up as compatible with sqlalchemy version 0.8 and up.
oh, pep8.
document SQLAlchemy version requirements
Merge branch 'pull1142'
Merge branch 'master' of github.com:buildbot/buildbot
align nine and master docs for buildsteps