make default value for `:message` on `AM::Errors` explicit.
Removing deprecation message and silencing method.

The deprecation rake task is no longer useful because the deprecated
methods have already been removed.

The method for silencing stderr has been removed since it was only
useful for `rake test:uncommitted` which was deprecated and removed.
Use activerecord 4.0.0 for reporting bugs using the template[ci skip]
Fixing links to accept_language plugin/middleware
Merge pull request #11137 from WvanLelyveld/master

There was a parenthesis in the guides, which resulted in the one link not working, and a second link not even showing. [ci skip]
Merge pull request #11136 from prathamesh-sonpatki/rails4

Use activerecord 4.0.0 for reporting bugs using the template
Merge pull request #11133 from wangjohn/remove_deprecation_rake_task

Removing deprecation message and silencing method.
Merge pull request #11054 from senny/11048_make_default_value_explicit

make default value for `:message` on `AM::Errors` explicit.
fix grammar, change 'an' to 'a' [ci skip]
Merge pull request #11139 from prathamesh-sonpatki/grammar

fix grammar, change 'an' to 'a' [ci skip]
use master branch activesupport