Add backlogged changes to the repository

notifier.py:
    This script aims to make an interface readily available to submit a
    native OS X (greater or equal than 10.8) notification. Specifically
    when using a QIIME/Emperor script. I originally wrote this intending
    to add it as a BASH_COMMAND but it turns out that this is way too
    slow for it to work so it will be stored here for posterity.

distance_matrix.py (test suite, library and script):
    This python code tries to address a use case where we wanted to see
    how equal to each other are multiple samples across a temporal
    gradient; more information in the script usage documentation.

utester.py:
    Minor modifications to make the code a little bit more readable.

make_convex_hull.py:
    Script to create a convex hull surrounding the samples of a specific
    category in a mapping file; to run this you need to have SciPy
    installed in your environment.

Remove replace_svg_object.py, this script now lives in it's own
repository.