Use helper method to get ENV['CONTENT_LENGTH']
Use Request#raw_post instead Request#body

In order to get raw_post to be not empty after
ParamsParser#parse_formatted_parameters,
added rewinding of body stream input on parsing json params.

Closes #11345
Added cursor pointer for 'More Ruby on Rails'

dropdown menu on guides page (which appear on small windows)
[ci skip]
Fixed broken link of Travis CI for rails and added full path
refactor to_sql so it does not depend on the to_sql implementation of
the connection
Fix a grammatical error/typo in Active Record Migrations guide. [ci skip]
Merge pull request #11370 from dpdawson/master

Fix a grammatical error/typo in Active Record Migrations guide. [ci skip]
actionview should be able to install using install.rb [ci skip]
Fixed broken rake task for update_version [ci skip]

Also added actionview to update version rake task
Removed unused require from actionview rakefile.
Merge pull request #11371 from arunagw/actionview-changes

Actionview changes
use latches rather than mucking with the scheduler
if we remove the connection from the pool, we should close it
remove dead code
close our connection when we are done
Remove redundant test about `push_with_attributes` removal.
link break added after the Travis CI link

link break added after the Travis CI link
Merge pull request #11373 from vipulnsward/remove_deprecated_test

Remove redundant test about `push_with_attributes` removal.
Merge pull request #11368 from Amit-Thawait/master

Fixed Travis CI link for rails
Merge pull request #11361 from jetthoughts/add_cursor_pointer_for_menu

Added cursor pointer for 'More Ruby on Rails' dropdown menu on guides page (which appear on small windows)