Notebook for time series example

The notebook is the beginning of a time series analysis of the
harmonic oscillator.
Add Kalman filters document

Add Kalman filters to document the approach we hope to take for MKS
time series.
Merge branch 'time-series' into MKStime
Explored Influence Coefficients as a function of time

Plot influence coefficients for the Cahn-Hilliard model as a function of time
starting with a random initial microstructure.