Improvements on some url helper methods and tests

Added as_json method for multibyte strings

warning removed: mismatched indentations

This reverts commit 5cad7a0d, reversing
changes made to bb842e8d.

Added `none` query method to return zero records.

Re-launch assets:precompile task using original $0 if $0 is batch file so it works on Windows

Set the timezone correctly for a test in activerecord/../base_test.rb

Test and fix for issue 4718

And added NullRelation class implementing the null object pattern for the `Relation` class.

Remove slash from favicon_link_tag method attribute

Refactor select helper and remove eval

reflection test fixed

Remove deprecation warnings from tests

Fix GH #4744. Don't run bundle install when executing `rails new app` with --pretend option

Fix typo in routing documentation

Only add ActiveRecord configuration if it is present

ids_reader method fixed, test added to has_many association (for PostgreSQL)

has_many/has_one, :dependent => :restrict, deprecation added

warning removed: shadowing outer local variable - klass

fix assets test