Merge pull request #759 from tubaxenor/patch-1

Relation#all is deprecated in Rails 4, use Relation#to_a instead

Conflicts:
	test/support/models.rb
Remove not used methods
Refactor test models to always delegate to a fake Relation object

This way both where and order methods are part of the fake relation
object and everything is delegated to that. Also, if we end up changing
the implementation to call some other method the we want this to fail
miserably, and it's better to use a bare object rather than an array to
avoid it passing by mistake.
Update changelog
Merge branch 'fix-relation-all-deprecation'

Relation#all is deprecated in Rails 4, use Relation#to_a instead.

Closes #759, thanks @tubaxenor.
Closes #798, no orm adapter for now.

Mongoid is known to not work with Simple Form collections automatically
since ever, users are supposed to give a :collection option when dealing
with associations, so this doesn't change that.

We may get better support for collections in mongoid in the future, but
lets get Simple Form out with better Rails 4 support for now, keeping
the same compatibility we always had.