Removed execute permission from:
  barchart/barchart.go
  pmap/pmap.go

Modified svg.go to handle external and embedded style

Added two demos for external and embedded style:
  styledemos/funnelstyled/funnelstyled.go
  styledemos/funnelstyled/main.go
  styledemos/funnelstylesheet/funnelstylesheet.go
  styledemos/funnelstylesheet/main.go
  styledemos/funnelstylesheet/style.css

Added adapter.go to make it easier to connect an io.Writer function into the net/http web server