Add Ribbon plots

[chriswyatt1]

Need to add a plot function to visualise the sytnenic regions between two genomes.

e.g.

Riparian plotting with GENESPACE

OR

RIdeogram:
https://cran.r-project.org/web/packages/RIdeogram/vignettes/RIdeogram.html

OR

https://github.com/tanghaibao/jcvi

[chriswyatt1]

Feature added, needs to be checked before publication ready: 9bf5e81