Removed defunct modules.
Fixed all __str__ functions
Changed filename in dataset so that it's saved as absolute path
Set meas_message as optional argument
Added printing of simulation object to Simulation.run
Updated add_measurement tests to account for new function
Removed completed item for TODO list.
First steps toward using Google style docstrings.
Removed ensemble from documentation.
Moved to Google-style docstrings in Observable object.
Fixed some docstring formatting issues.
Moved notes in Lattice init docstring to end of docstring.
Added item to todo list
Added detail on numpy array shape to Config constructor docstring
Added missing parameter to Lattice construct docstring.
Changed to Google docstrings in propagator.