Fix - `to_s(:db)` in numeric range

Add test coverage for ActiveSupport::NumericWithFormat#to_formatted_s

Add a missing require to ActiveSupport::NumericWithFormat

Fix #first(limit) to take advantage of #loaded? records if available

This resolves the following error:

```
Error:
TestAdapterWithInvalidConnection#test_inspect_on_Model_class_does_not_raise:
TypeError: superclass mismatch for class Mysql2Adapter
    /Users/senny/Projects/rails/activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb:35:in `<module:ConnectionAdapters>'
    /Users/senny/Projects/rails/activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb:34:in `<module:ActiveRecord>'
    /Users/senny/Projects/rails/activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb:6:in `<top (required)>'
    /Users/senny/Projects/rails/activesupport/lib/active_support/dependencies.rb:302:in `require'
    /Users/senny/Projects/rails/activesupport/lib/active_support/dependencies.rb:302:in `block in require'
    /Users/senny/Projects/rails/activesupport/lib/active_support/dependencies.rb:268:in `load_dependency'
    /Users/senny/Projects/rails/activesupport/lib/active_support/dependencies.rb:302:in `require'
    /Users/senny/Projects/rails/activerecord/lib/active_record/connection_adapters/connection_specification.rb:174:in `spec'
    /Users/senny/Projects/rails/activerecord/lib/active_record/connection_handling.rb:50:in `establish_connection'
    /Users/senny/Projects/rails/activerecord/test/cases/invalid_connection_test.rb:12:in `setup'
```

Removed extra "the" in the documentation of `broadcast_message` [ci skip]

It's numeric and the framework is called Action Controller.

Document `Logger#broadcast_messages` option

CHANGELOG entry for petabyte and exabyte

Add support for Petabyte and Exabyte in number to human size

fix link to pr [ci skip]

[ActionCable] remove not needed protected call and newlines

Add Ruby 2.3.0 to Travis matrix

Changed default value of `:rc` option to `nil`

- This fixes an error thrown by Thor because type of default value of
  `:rc` option which is `:boolean` does not match with it's default type
  which is `string`.
- Ref - https://github.com/erikhuda/thor/blob/master/lib/thor/parser/option.rb#L125

Fix varbinary with default ''

Improve documentation for `config.ssl_options`

I realized that `first(2)`, etc. was unnecessarily querying for the
records when they were already preloaded. This was because
`find_nth_with_limit` can not know which `@records` to return because
it conflates the `offset` and `index` into a single variable, while
the `@records` only needs the `index` itself to select the proper
record.

Because `find_nth` and `find_nth_with_limit` are public methods, I
instead introduced a private method `find_nth_with_limit_and_offset`
which is called internally and handles the `loaded?` checking.

Once the `offset` argument is removed from `find_nth`,
`find_nth_with_limit_and_offset` can be collapsed into
`find_nth_with_limit`, with `offset` always equal to `offset_index`.

All uses of the `offset` are passing `offset_index`. Better to push
down the `offset` consideration into `find_nth`.

This also works toward enabling `find_nth_with_limit` to take
advantage of the `loaded?` state of the relation.

✂ whitespace in generated config files [skip ci]

A `(?:var)?binary` with default '' is a correct definition.
Remove `missing_default_forged_as_empty_string?` method for fixing this
issue because this method is a workaround for older mysql legacy adapter
(19c99acf, f7015336).

fix TypeError when using submit_tag with Symbol value

Fix typo on documentation

Plugin Usage and Installation instructions

Didn't like the constant being at the top of the file, gave it overdue importance.

Now that `color_output` expects a result we can shorten some of the flexibility
from earlier:

  * Inline COLOR_CODES constant (keep local variable for readability,
    but don't need names of colors at run time).
  * Inline color variable in `color_output`. Looks just as clear without it.

Focus `color_output`'s intent on coloring output by a result. We aren't meant
to pass it arbitrary codes to color output.

The word color is being thrown all around with slightly different meanings.

Right now, I understand it. But I'd like to be more immediately clear.

I got the blues because we aren't coloring any lines blue.