add debug drawing for text blocks
inset -1,-1 custom text block drawing

Because of the clipping of the text content view's area without this part of the border would be clipped
improved handling of margin and padding CSS styles

margins are presently only considered for block-level elements. they are added for left and right. bottom margin becomes the space after a block = paragraphSpacing.

There is a workaround in place because the left padding interferes with list indenting

What should really be done here is calculate the cumulative block and/or list indenting from the margin values of the parents
Added DTEdgeInsetsRelativeToCurrentTextSize:textScale:

this is used to parse margin/padding CSS attributes with multiple values.
Merge branch 'master' of github.com:Cocoanetics/DTCoreText