- Followup of https://github.com/rails/docrails/commit/10bc49710b7205a6172c3e072b3c77114fefd952

[ci skip]

We have `caller_locations`, so we don't need to parse the strings in the
callstack.

[Robin Dupret & Shunsuke Aida]

* Fix a few typos
* Wrap lines to 80 chars
* Use `+` instead of `<tt>`

Fix a typo in rdoc (*expect* for *except*)

ActiveSupport::Deprecation is now a class rather than a module. You can
get instance of ActiveSupport::Deprecation calling #instance method.

  ActiveSupport::Deprecation.instance

But when you need to get new object od ActiveSupport::Deprecation you
need to just call #new.

  @instance = ActiveSupport::Deprecation.new

Since you can create a new object, you can change the version and the
name of the library where the deprecator concerned.

  ActiveSupport::Deprecation.new('2.0', 'MyGem')

If you need use another deprecator instance you can select it in the
options of deprecate method.

  deprecate :method, :deprecator => deprecator_instance

Documentation has been updated.

test local deprecation

deprecator object

Test ActiveSupport::Deprecation when included

In AS, only inflector/methods is need in proxy_wrappers.rb, as well as date, date_time, and time conversions.rb. This fixes an issue when requiring json and AS saying that i18n is also required.
Signed-off-by: NSantiago Pastorino <santiago@wyeworks.com>