Add config/tokens.yml template
Remove secret_token.rb
Load secret_key_base from tokens.yml, fallback to config.secret_key_base
Replace config.secret_key_base with secrets.secret_key_base in test
Add test for custom tokens stored in config/tokens.yml
Rename tokens.yml to secrets.yml
extract PG range tests from datatype_test.rb into range_test.rb
refactor, reuse assertions in range_test.rb.
Fix mysql to support duplicated column names

This will fix the [broken
test](https://github.com/rails/rails/commit/4a2650836680f51490e999c3c8441a2f9adff96e)
 `test_with_limiting_with_custom_select`.

The query's result was built in a hash with column name as key, if the
result have a duplicated column name the last value was
overriding the first one.
Merge pull request #13306 from kassio/master

Fix mysql to support duplicated column names
argument prefix warning removed

* interpreted as a argument prefix
Merge pull request #13309 from arunagw/warning-fix-argumnet

argument prefix warning removed
Add comment about secret_key_base in secrets.yml
Merge pull request #13298 from rails/secret_tokens

Create config/secrets.yml file for store of tokens
Fix typo [ci skip]
Improve document: working with javascript in rails [ci skip].
* Add form_tag generated output.
* improve some text.
* data-remote='true' should use double quotes.
Merge pull request #13316 from JuanitoFatas/working-with-js

Improve document: working with javascript in rails [ci skip].
support creating temporary tables from queries

also override drop_table in AbstractMySQLAdapter to properly drop
temporary tables without committing the transaction
Fix syntax error in redirect_to example

Without parenthesis, ruby assumes that curly braces denote the beginning
of a block.
Merge pull request #13324 from fphilipe/fix-syntax-error-in-example

Fix syntax error in redirect_to example