Footnote: Add Footnote to ggplot2 Objects
In SciencesPo: A Tool Set for Analyzing Political Behavior Data

Add footnote to ggplot2 objects.

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Footnote(note, x = 0.85, y = 0.014, hjust = 0.5, vjust = 0.5,
  newlines = TRUE, fontfamily = "serif", fontface = "plain",
  color = "gray85", size = 9, angle = 0, lineheight = 0.9, alpha = 1)

`note`	string or plotmath expression to be drawn.
`x`	the x location of the label.
`y`	the y location of the label.
`hjust`	horizontal justification
`vjust`	vertical justification
`newlines`	should a new line be appended to the start and end of the string, for spacing?
`fontfamily`	the font family
`fontface`	the font face ("plain", "bold", etc.)
`color`	text color
`size`	point size of text
`angle`	angle at which text is drawn
`lineheight`	line height of text
`alpha`	the alpha value of the text