Revert "Merge pull request #6 from ajishbabu/master"

Strangely, https://github.com/rock-core/base-orogen-types/pull/7 did not resolve the error mentioned there, the wrench type also needs to be removed here.

This reverts commit e2d6583164f110a9622c039dd5f9663bcec17e5e, reversing
changes made to f5270ad1a57b2b41c440f544279ffcc6c756ba77.