Initial commit of DPP example code.

Adding tex source for creating DPP probability trees, and png files
compiled from it (converted to png by imagemagick). Adding javascript
code for embedding, annotating, and updating the png files of the DPP
trees. Lastly adding html file that sources and calls the main
javascript function.
Merge branch 'master' of github.com:joaks1/dirichlet-process-trees

Merging LICENSE file created via GitHub.