reverting decoupling of NumberHelper from safe_join and adding tests for escaping of delimiters and separators

Change prompt to options hash in grouped_options_for_select

Revert "Revert "Remove `:disable_with` in favor of `'data-disable-with'` option from `submit_tag`, `button_tag` and `button_to` helpers.""

Finally remove `:disable_with` but use `:data => { :disable_with => ... }`
in examples to show off a better API (which looks nicer in Ruby 1.9)

This reverts commit a5c38a9c.

Revert "Remove `:disable_with` in favor of `'data-disable-with'` option from `submit_tag`, `button_tag` and `button_to` helpers."

`disable_with:` is much easier to type than `"data-disable-with" =>`,
and the fact it uses "data-disable-with" => is an implementation concern,
it should not affect the public API.

This reverts commit 683fc4db.

Remove `:disable_with` in favor of `'data-disable-with'` option from `submit_tag`, `button_tag` and `button_to` helpers.

using split_paragraphs method and content_tag instead of string
concatination

Support data: url scheme

Conflicts:
	actionpack/lib/action_view/asset_paths.rb

Introduced in 0f848dd5.

and display size 1 and not multiple attribute,  Fixes #5908

Changed /images and /fonts to /assets in the examples of
image_path, image_tag and font_path helpers

[ci skip]

This reverts commit 667d0bdd, reversing
changes made to 4ae6bab6.

Fix NumberHelper options wrapping to prevent verbatim blocks being rendered instead of line continuations.  While I'm at it, wrap long comment lines consistently.