Using URI.parser.unescape

Fixes warning

warning: URI.unescape is obsolete

This fixes railties tests in JRuby but break it in MRI
This reverts commit fea99276.

Isolate railties Generators Tests

With this change jruby should pass all of the railties tests.

Add timeout to test_async_stream

Fix jruby warning when capture calls unlink on an open tempfile

Jruby cannot unlink a tempfile unless it is closed first.

Fix ActiveSupport::Testing::Isolation on jruby

As we are doing debug mode on

we don't need to silenced it

Replaced quotation marks for term by apostrophes in getting started guide [ci skip]

Without timeout:
this test executed infinitely on JRuby
Passes on MRI

With Timeout:
this test gracefully fails on JRuby
Passes on MRI, tested on v2.0 & v1.9.3

Added action_view in Rails::Info

Define enable_extension method to prevent undefined method error

When mixing postgresql and another adapter like sqlite3 (for dev and test
respectively), the task `db:test:prepare` will fail due to the `enable_extension`
method not being defined in the abstract adapter. This patch simply adds an
empty definition to prevent it.

fix a gramatical mistake

Removed redundant xml override from pg adapter

map => map! for stopping extra array creation

in getting started guide for section 5.6

[ci skip]

Fix changelog typos [ci skip]

Closes: #11706

Hopefully the first of many related to #11700.

With these changes the railties tests wont 100% pass but at least they
will run and show the errors.

The first problem was the @method_name variable was never set.
This was causing ENV["ISOLATION_TEST"] to always be nil which
would cause the test output to never be written to the tempfile.

The second problem was that an invalid -t option was being passed
to minitest and minitest was erroring out.

The third problem was the run method needs to always return an
instance of the test class it is trying to isolate. We were returning
a ProxyTestResult instead.

test_registering_new_handlers and test_count_on_invalid_columns_raises can be case insensitive

tesetcases assertion to case insensitive because Oracle database adapter
handles table name in uppercase.