Add all attributes for nodes and edges

[randrescastaneda]

Dear @rich-iannone ,

I just added all the available attributes for nodes and edges of this page . Right now it is not possible to add edge attributes like arrowhead or minlen . However, with this small addition it is possible.

thanks.

[rich-iannone]

@randrescastaneda Thanks for the PR! Would you be able to fix the failing tests? Also node_aes() (https:/rich-iannone/DiagrammeR/blob/master/R/node_aes.R) and edge_aes()(https:/rich-iannone/DiagrammeR/blob/master/R/edge_aes.R) both need to be revised to accommodate the new parameters. Also, this vignette needs to be updated: https:/rich-iannone/DiagrammeR/blob/master/vignettes/node-edge-data-frames.Rmd.

[randrescastaneda]

Absolutely. It would be a pleasure.
I'll notify you when it is ready.
Best,