dendrograms/astrodendro — pull request #133 by keflavich (2014-10-23 10:44:36+00:00)
Title: plot_tree should accept singular structure

fix bug introduced in 4c5a6432be45b9878b1df84ba38aa4186ca6712b:
'structures' can be an int (since plot_tree accepts singular 'structure'
which intuitively should be an int)