Remove extra case.
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 #11827 from vipulnsward/remove_extra_case

Remove extra case.
Merge pull request #11997 from startupjockey/add_credits_AS

Adds Akshay Surve to Rails Guides credits list [ci skip]
fix typo in the credit section of the guides. [ci skip]
Add Finder API changes to upgrading guide [skip ci]
Warning on doc for assets under lib|vendor not precompiling
Merge pull request #12015 from vipulnsward/add_dynamic_finders_to_upgrade

Add Finder API changes to upgrading guide [ci skip]
Soften wording about knowing other devs.

Many people don't, so point them to a place where they can meet
some.
Flesh out feedback portion of contributing guide.

I don't know of anyone that hangs out in #rails-contrib, and we should
also let people know that feedback can take some time.
Add note about features vs. bugs.

Sometimes people ask what makes a feature and what makes a bug, so
let's clarify that so we can show it to people later.
Merge pull request #11986 from fedesoria/patch-3

Warning on doc for assets under lib|vendor not precompiling
Add config to method calls in fixtures.

Allows you to change your configuration for calls to
`table_name_prefix`, `table_name_suffix`, and `pluralize_table_names`.
The default configuration is still ActiveRecord::Base, but you are now
able to change the configuration easily.
Remove whiny_nils config from the rails guides

This option was removed from master.

[ci skip]
Merge pull request #12032 from carolinemota/fixdoc

Remove whiny_nils config from the rails guides [ci skip]
Merge pull request #12034 from wangjohn/fixtures_config_changes

Add config to method calls in fixtures.
Perf: fields in pg gem causes an allocation, cache it
Perf: avoid array allocation where not needed
Merge pull request #12037 from SamSaffron/mem_alloc

Performance: Reduce memory allocations in Active Record
Perf: memoize serialized column list and time zone column list