split multiline string into vector of one-liners (#10)

this is needed for image/svg+xml and text/html, fix #8

src/Literate.jl

@@ -529,7 +529,14 @@ function execute_notebook(nb)
  execute_result["output_type"] = "execute_result"
  execute_result["metadata"] = Dict()
  execute_result["execution_count"] = execution_count
- execute_result["data"] = IJulia.display_dict(r)
+ dd = IJulia.display_dict(r)
+ # we need to split some mime types into vectors of lines instead of a single string
+ for mime in ("image/svg+xml", "text/html")
+ if haskey(dd, mime)
+ dd[mime] = collect(Any, eachline(IOBuffer(dd[mime]), chomp = false))
+ end
+ end
+ execute_result["data"] = dd
 
  push!(cell["outputs"], execute_result)
  end