Test against ActiveModel ~> 4.0.0.rc1
Try to exclude ruby < 1.9.3 and activemodel 4.0
Add ability to request new object via API when calling build
Do not use #blank? because the data might be an empty array
Do not call define_method as a public method
add @stevschmid to the list of contributers 

Steven is an evolving and promising youngster, who has just started Ruby development two months ago. Since then, he contributed to numerous open source projects including the awesome Ruby ORM Gem called "Her".
To honor Stevens efforts, I am hereby adding him to the respectable list of contributors of this project.
Add JSON development dependency
Bump version to 0.6.7
Fix default_scope
Whoops, remove “focus”
add #find to association
Update .travis.yml and Gemfiles
Use a separate Gemfile for activemodel-3.2.x
Use 1.8.7 hash syntax in Gemfiles