be more specific about csrf token and ajax - not whitelisted outside of jquery-rails [ci skip]
add include_hidden option to collection_check_boxes helper
Save has_one associations only if record has changes

Prevents save related callbacks such as `after_commit` being
triggered when `has_one` objects are already persisted and have no
changes.
Only use BINARY for mysql case sensitive uniqueness check when column has a case insensitive collation.
Fixed typo [ci skip]

singular is more suited to
change to "check out"
e-mail => email, and subject/verb agreement
add punctuation
Remove duplicate configuration option for ActiveSupport [ci skip]

Fixes rails/rails#13732
`requies` => `requires`
`easiy` => `easy`
`framwork` => `framework`
Remove old comments about suppressing warnings.
Adding an documentation example and a test to button_to with path

I did not see in the docs that `button_to` supports not only URLs but paths as well. I documented this functionality with a unit tests and added an example to the docs as well.
Merge pull request #13924 from adomokos/adding_path_examples_to_button_to_tests

Adding a documentation example and a test to button_to with path
fix HABTM w/out primary key errors on destruction
Fixes the camelCase variable name in the docs [ci skip]
Merge pull request #13926 from fredwu/doc_polymorphic_sti_var_name_typo

Fixes the camelCase variable name in the docs [ci skip]
Fixed minor typo [ci skip]
Merge pull request #13930 from calvintam/master

Fixed minor typo [ci skip]