Added TODO list for Wei

% 12/9/2014:
% For next week: Wei Yao
% 1. learn to submit code onto github:  2 commits
% 2. try this code:
http://blogs.mathworks.com/steve/2006/06/02/cell-segmentation/  it has a
walk-through example.
% 3.    for two images, click on each umbrella so we have a ground-truth
image
% 4.        if you have time, try this (can you find the code online?):
% C. Zhang, C. Sun, R. Su, and T. D. Pham, Segmentation of Clustered
Nuclei Based on Curvature Weighting, In Image and Vision Computing New
Zealand, Dunedin, New Zealand, 26-28 November 2012, pp.49-54.
% %http://dx.doi.org/10.1145/2425836.2425848
% 5. if you have time, close-caption a few minutes of the video.  Email
Aaron where you ended.