Fix typo in file path, should include extension.
Adds Akshay Surve to Rails Guides credits list

I had written the original guide for "A Guide to Testing Rails
Applications". The current documents maintains the same structure and
examples I had drafted albeit with some minor changes to keep up with
newer version of Rails.

Older version which had credits included:
http://guides.rubyonrails.org/v2.3.11/testing.html

Github lifo/docrails History:
https://github.com/rails/rails/commits/ff359af86505b4d317b7467e7f79aa2ef2c5e795/railties/doc/guides/source/testing_rails_applications.txt
Merge pull request #11996 from semaperepelitsa/master

Docs: fix typo in file path, should include extension. [ci skip]
cleans the guides sources from fancy non-ASCII stuff
Deprecating passing strings as class name in fixtures.
Merge pull request #11960 from kirs/xhr-errors

Show exceptions in text format for xhr requests
typo [ci skip]
Merge pull request #11984 from wangjohn/proper_table_name

Making proper_table_name take in options.
Merge pull request #12000 from wangjohn/deprecating_class_name_string_in_fixtures

Deprecating passing strings as class name in fixtures.
Adding deprecation assertions for proper_table_name.

This prevents deprecation warnings from popping up.
Merge pull request #12008 from wangjohn/skipping_deprecated_migration_tests

Skip tests using deprecated +proper_table_name+ method.
Removing instances of string class_names in fixtures.

Also, constantizing the default_fixture_model_name when it gets loaded
in from the file. Later, when the class_name is passed to a new
FixtureSet, a deprecation warning will occur if the class_name is a
string.
Changing deprecation_horizon to be Rails 4.2

Also, +ActiveRecord::Migrator.proper_table_name+ should actually have a
deprecation horizon of Rails 4.2 (not 4.1).
Move view_paths from AP to AV
Require only path_set && lookup_context instead of whole base
Move rendering from AP to AV
Add loading 'action_view' as part of rails/all
Move layouts to AV
Hook up AV::Rendering on AV intialization
Revert "Require only path_set && lookup_context instead of whole base"

This reverts commit 77bb03df2ca3687b290e9fe77d21007642f0329c.