bump Gemfile.rails4
Make rails 4 the default Gemfile
Bump rails to 4.0.4
Fix require to make update_serialization_format work again
Remove after_touch callback.

Also add timestamps to a few testing models
Set updated_at column on serialized test
Add after touch for rails < 4.0.4
Use Gem::Version to check version
Test on ruby 2.1.1
Merge pull request #138 from Shopify/fix_rails_404

Fix under rails 4.0.4+
Bump version to 0.1.0
Update changelog
Remove unused var
Add inverse_of to tests.

On 4.1 inverse_of is automatic identified, so we can add for now, to
make tests compatible with 4.1
Move association reset to setup
Merge pull request #139 from Shopify/add_inverse_of

Add inverse_of to tests.
Add rails 4.1 tests to travis
remove deprecated_finders
Merge pull request #140 from Shopify/41

Tests on rails 4.1
Trivial optimization