Changes: add missing entry for 0.25
Revert "MakeMaker.pm: use both -pthread and -lpthread" (closes #24)

This reverts commit d027db94660087eb71bcead50a576143d111ab2e.
travis: run release tests too
Raw.pm: import FFI::Raw::Ptr to avoid a bug in perl < 5.10.1
dist.ini: require perl >= 5.10