Don't reset inheritance_column when setting explicitly.

This is backported from master (cdfcbc4).
Added changelog for 55e2954
Merge pull request #9576 from fredwu/backport_fix_explicitly_inheraitance_column_to_3_2_stable

[Backport to 3-2-stable] Don't reset inheritance_column when setting explicitly.
Fixed test failures on 1.8.7 caused by 74e59ea
Merge pull request #9943 from fredwu/test_fix_for_74e59ea

Fixed test failures on 1.8.7 caused by 74e59ea
Removing explain support warning from the Railtie

This is causing a regression since the Active Record Railtie is trying to
connect to the development database in the application boot.

See https://github.com/rails/rails/pull/6197#issuecomment-15199273
Add attr_accessible to the Getting Started Guide.

This was brought up in #9995, but is only present in 3-2-stable, since
mass assignment is removed from Rails 4.
Fix formatting and minor review in AP changelog

Sentences starting with # are considered headings.
Common behavior with adding formats to lookup_context for TemplateRenderer and PartialRenderer
Chained scopes will be preloaded properly. Fixes #7490
Merge pull request #7792 from seejee/chained_scopes_preload_properly

Fixes Issue #7490: Chained scopes will preload properly
Use 1.8 hash style in test views

Introduced in 2c22376fe04b89e8f34620139720b85a85ce3428
Fix typo in view name

Introduced in 2c22376fe04b89e8f34620139720b85a85ce3428
Fix explicit names on multiple file fields

If a file field tag is passed the multiple option, it is turned into an
array field (appending "[]"), but if the file field is passed an
explicit name as an option, leave the name alone (do not append "[]").

Fixes #9830
Merge pull request #10105 from rmm5t/fix-explicit-name-on-multiple-fields

Fix explicit names on multiple file fields
Improve the changelog entry [ci skip]
Merge branch '3-2-stable' of git://github.com/rails/rails into 3-2-stable