Simulated distribution of the results in Issue 11

Added a function to simulate the results in Issue 11 for D=2, M=100, and
T=10000.
Added sample mean and expected mean

Display information of sample mean and expected mean after showing the
histogram of simulated data in simulate_distribution_issue11.m.
Added ellipsoidal function with exponential noise

Added a rotated and shifted ellipsoidal test function with mixed
exponential noises.