Merge pull request #63 from stephentu/master

fix some compile issues on OS X
Merge pull request #65 from stephentu/master

shut the compiler up
Merge pull request #66 from stephentu/master

allow extra include paths to be specified via env vars
Add MixtureValueScorer::validate methods to check array sizes
Remove confusing no-op MixtureSlaveGroups::init method
Fix bug in dd mixture validation
Bump to version 2.0.17
Add comment documenting data debt support
Add distributions::Protobuf<T>::t template metafunction
Merge remote-tracking branch 'origin/master'