add new methods of procedural text generation

[joeclark-phd]

Some other potential methods might include:

• procedurally generating syllables from sets of syllable beginnings, middles, and endings
• randomly generating text made up of syllables (either real ones, or procedural ones as above)
• text generation based on phonetics, to make new text that has a desired sound
• other machine-learning based algorithms
• ???

If you have an idea for a new method, fork the repo, code it up as a class implementing the RandomTextGenerator interface, and give me a pull request.

[joeclark-phd]

This "cluster chaining" method looks like a good candidate: http://roguebasin.roguelikedevelopment.org/index.php?title=Cluster_chaining_name_generator