Fix setter so IE7/8 can set text of style element

fixes #2265

Our setters brake old IE when setting text of a style element.
This pull request adds a alternative `propertySetters.text` in case the problem exists in the Browser.

Used some ideas from @arian's  fix on his `fix-2265-text branch`.
@arian  your eyes are shaper today than when you wrote that line yourself :smile:

Thank you for feedback! Updated the PR with the fixes you suggested.