Rollup of v0.13.x fixes

See v0.13-fixes branch for individual fixes

Conflicts:
	CHANGELOG.md
	lib/squib/version.rb
	squib.gemspec

lib/squib/graphics/image.rb

@@ -88,11 +88,11 @@ module Squib
 
         cc.operator = paint.blend unless paint.blend == :none
         if paint.mask.to_s.empty?
-          cc.render_rsvg_handle(svg, svg_args.id)
+          cc.render_rsvg_handle(svg, id: svg_args.id)
         else
           tmp = Cairo::ImageSurface.new(box.width / scale_width, box.height / scale_height)
           tmp_cc = Cairo::Context.new(tmp)
-          tmp_cc.render_rsvg_handle(svg, svg_args.id)
+          tmp_cc.render_rsvg_handle(svg, id: svg_args.id)
           cc.set_source_squibcolor(paint.mask)
           cc.mask(tmp, 0, 0)
         end

lib/squib/graphics/save_pdf.rb

@@ -30,7 +30,7 @@ module Squib
               card.cairo_surface.finish
               cc.save
               cc.scale(0.8, 0.8) # I really don't know why I needed to do this at all. But 0.8 is the magic number to get this to scale right
-              cc.render_rsvg_handle(RSVG::Handle.new_from_file(card.svgfile), nil)
+              cc.render_rsvg_handle(Rsvg::Handle.new_from_file(card.svgfile))
               cc.restore
             else
               abort "No such back end supported for save_pdf: #{backend}"