This reverts commit 3420a145, reversing
changes made to afb66a5a.

The current code base is not uniform. After some discussion,
we have chosen to go with double quotes by default.

html_safe is not supposed to be public API for AV. This change removes usage of html_safe in favour of raw() in AV helpers.
Also changed usage of html_safe to make use of raw() instead so that the intended behaviour is verified with raw()

[skip ci]

In tag helper, honor html_safe on array parameters; also make safe_join more similar to Array.join by first calling flatten.

/cc @tenderlove

This reverts commit fa6d921e.

Reason: Not a fan of such massive changes. We usually close such changes
if made to Rails master as a pull request. Following the same principle
here and reverting.

[ci skip]

For future reference, this is the regex I used: ^\s*#\s*\n(?!\s*#). Replace
with the first match, and voilà! Note that the regex matches a little bit too
much, so you probably want to `git add -i .` and go through every single diff
to check if it actually should be changed.

Removed Array#safe_join in AS core_ext and moved it to a view helper with the same same. This also changes how safe_join works, if items or the separator are not html_safe they are html_escape'd, a html_safe string is always returned.
Signed-off-by: NJosé Valim <jose.valim@gmail.com>

Applied the wrong version.

This reverts commit 98c0c5db.