remove unused method from Postgresql::Adapter

Titling the model name in views generated by scaffold.

Extract out with_env_tz helper method.

It’s used at so many places that extracting it out into a helper file
is worth doing.

Move cleanup into teardown, delete obsolete code.

eg. rails g scaffold UserProfile will have in index.html.erb "Listing User Profiles"
rather than Listing user_profiles.

Don't type cast the default on the column

Detect in-place changes on point types

It was being used by Rails for show the development logs but since Rails
4 it is not being used anymore on the framework.

This class seems to be private but it were part of the public API we are
deprecating before removing.

Enable hstore in array tests

Detect mutations of arrays and array members

Also remove --skip-turbolinks.

This option is useful if users want to remove some gems like jbuilder,
turbolinks, coffee-rails, etc that don't have specific options on the
generator.

    rails new my_app --skip-gems turbolinks coffee-rails

Ensure `OID::Array#type_cast_for_database` matches PG's quoting behavior

Also takes a step towards supporting types which use a character other
than ',' for the delimiter (`box` is the only built in type for which
this is the case)

Move pg array database type casting to the Array type

Add an option to skip installation of Turbolinks

Add test cases for Migration#inverse_of

If we want to have type decorators mess with the attribute, but not the
column, we need to stop type casting on the column. Where possible, we
changed the tests to test the value of `column_defaults`, which is
public API. `Column#default` is not.

The case where we have a column object, but don't have a type cast
method involves type casting the default value when changing the schema.
We get one of the column definition structs instead. That is a case that
I'm trying to remove overall, but in the short term, we can achieve the
same behavior without needing to pass the adapter to the array type by
creating a fake type that proxies to the adapter.

Don't assume that Hstore columns have always changed

HStore columns come back from the database separated by a comma and a
space, not just a comma. We need to mirror that behavior since we
compare the two values.

Also adds a regression test against JSON to ensure we don't have the
same bug there.

Use `column_defaults` in dirty for checking changed defaults

We no longer need to "init changed attributes" from the initializer,
either, as there is no longer a case where a given value would differ
from the default, but would not already be marked as changed.

Don't mess with `column_defaults` when optimistic locking is enabled

Move test teardown into `ensure` block.

[ci skip] doc corrected : ActiveRecord::Base.connections to ActiveRecord::Base.configurations