Mark cleaned strings as HTML safe

[damien]

First off, thanks for putting this gem together @vjt! It saved me a good day of work integrating the sanitize gem into my employer's codebase.

Anyway, back on topic: I'd like to introduce a change to sanitize-rails that would automatically convert all cleaned strings into a SafeBuffer. This would mark any cleaned text/attributes as HTML safe and prevent already cleaned text from being escaped a second time by default when rendering said text in rails views.

Would a pull request I make for this be accepted? I notice there aren't any tests on this gem yet, so I can introduce the beginnings of a test suite with this feature as well.

[vjt]

Hey @damien 😄, your proposal makes lots of sense. If you also start laying out the test suite.. I'll be morally obliged to offer you at least two 🍻!

Please go on, I'll gladly review and merge 👍

Thanks!

[damien]

Will do, I should have some horrible code for you to make fun of by this evening (I'm operating in PDT, GMT -7)