upgrade to 3.2.9

* adding bezierPath.text("hello", font="Times")
* adding option to save only the last page or all pages both for images as for pdfs and svgs
* adding imageSize(path)
* making the FormattedString more flexible
* updating docs
Merge branch 'master' of https://github.com/typemytype/drawbot
adding missing doc pages (editor, preview) + small tweaks