Merge remote-tracking branch 'origin/yao_dev' into black_dev
Set up the main file to print out the notes for the day on linear models
Fixed the difference between branches
Added images for a single tanke problem
Added a new image for the first tank problem example.
Merge pull request #48 from KellyBlack/black_dev

Added a new image for the first tank problem and made a minor word changing for one Newton's Law of Cooling problem.
Added the annotated single tank image
Merge pull request #49 from KellyBlack/black_dev

Forgot to add one image - the annotated single tank image
Added a new matlab file to generate a nicer image for the first autonomous eqn example.
Changed the slope field script for a different example.
Added a new image of a slope field for a clicker quiz on stability
Updated the lecture on autonomous equations.
Merge pull request #50 from KellyBlack/black_dev

Updated lecture on autonomous equations
Updated the first lecture on complex numbers.
Merge pull request #51 from KellyBlack/black_dev

Merge changes for the first lecture on complex numbers
Added a new image for an example of a point in the complex plane.
Updated the second lecture on complex numbers
Changed the format for the table of contents in all files.
Merge pull request #52 from KellyBlack/black_dev

Updated the second lecture on complex numbers.
merge