financialforcedev/fflib-apex-common — pull request #25 by up2go-rsoesemann (2014-08-18 13:19:14+00:00)
Title: Fixed issue 24...

Fixes Issue https://github.com/financialforcedev/fflib-apex-common/issues/24 (fflib_QueryFactory().selectFieldSet() fails with when FieldSet queries
namespaced fields"

Root cause: Field namespaces are internally stored as lowercase map key but not converted when passed in
Solution: add .toLowerCase()