try gemfile
fix
more fixes
Fix broken has_many associations

* Ensure columns are passed as symbols instead of strings
Fix reflection creation

* I didn't write this: just applied from @hgillane's fork
* Support two-part reflection creation process: AR::Reflection.create, add_reflection
* Previous direct-creation path is still there

https://github.com/hgillane/active_hash/commit/51a47558a0ee1813d4818f49e2688dc85851d46d
explicitly require yaml
Update travis config for new Ruby 2.1.x

Remove 2.1.0 and 2.1.1 as both contain regressions. Also update
excludes, since Rails 2.3 does not like Ruby 2.1.
Merge pull request #92 from neo/pr_90

Update for Rails 4.1