do not introduce a new method for stubbing users
update CHANGELOG [ci skip]
Cleanup user building a little bit
Update to Rails 4 release.

Rails 4 has now been released. Unfortunately, the '>= 4.0.0.rc1'
dependency doesn't work with the release.

Change-Id: I0db87057dfe8f8dd5c9947a21df4b6b7e060d898
Merge pull request #832 from freerunningtechnologies/rails-4-release

Update to Rails 4 release.
input without additional classes should add "checkbox" class to label

closes #809
Merge pull request #810 from plataformatec/issue-809

input without additional classes should not add "checkbox" class to label
Note about ORM compatibility for association helper in source code and README.
Merge pull request #839 from slainer68/readme_orm

Note about ORM compatibility for association helper in the README and source
Merge branch 'master' of https://github.com/plataformatec/simple_form