Fix #425
Merge branch '3-2-stable'
Resolve multiple nested fields_for

Closes #423
Add support to use remote validations when Rails application has been mounted on a custom path
fix for tests
Merge pull request #465 from maintux/master

remote validations
Merge branch '3-2-stable'
fix issue #461
Merge pull request #470 from maintux/3-2-stable

Rebase 3-2-stable with fix for issue #461.