Fixing supported doctrine-module revisions at 0.5.x
Capping dependency to doctrine-module to 0.6 series
Making dependency to migrations optional, cleaning docs
Master is now aliased 0.7.x
Merge pull request #163 from doctrine/cleanup/migrations-optional-dependency

Making dependency to migrations optional, cleaning docs
Merge pull request #164 from doctrine/0.6.x

0.6.x merge into master