Alpha diversity boxplots

Added code to create alpha diversity boxplots, one for each metric in the collated alpha directory. Each plot has boxplots for each body site, and within each body site there are two plots (self versus other).

Also added options to personal_results.py script to suppress various types of output (mainly to aid in testing, as the script takes a long time to run when producing all types of output).

@gregcaporaso, you'll likely want to update the alpha diversity boxplot text in format.py to your liking (the description I gave is pretty barebones).

This resolves issue #7.