Add functions to help load data

New file Analysis/loadData.py. Currently just has one function
that loads data from a pickle file, but others could be added
to save to pickle and save/load from different formats.
Add script for managing plots

makePlot.py sets some default matplotlib settings (in
defaultSettings.py), runs plotting commands given in a script specified
as a command line argument, and either displays or saves the plot.
Add script to plot histograms of local ping time