Updating Rails versions, adding 4.2
Add Rails 4.1 and 4.2 to Travis test matrix.
Add required timestamps null option for Rails 4.2.
Load multi-schema before TS, Combustion.
Can't rely on ActiveRecord::Base.reflections

Rails 4.2 has switched the hash keys to strings. reflect_on_association accepts both string or key parameter.
Workaround for association reflection class changes.

Now no longer using a subclass of AssociationReflection - we weren't using anything within the class anymore anyway. So, that's good. Supporting three different approaches for generating associations isn't quite so fun though.