add ipython notebook version of assignment
edit copyright notice
Added derivation of rocket equation
Added code to monitor center of plate
Added code to monitor temperature in center of plate - implicit
Added code in C-N

    * Added 1D code in C-N
    * Added welcome message in C-N and 2D implicit
    * Typo in 2D implicit
fix hacky working versions to be proper working versions

wasn't multiplying the creation / destruction terms by delta t.
constants have been fixed (or are on their way to being fixed) to work
with a proper mathematical formulation.
all conditions fixed so visualizations work as expected
Merge remote-tracking branch 'refs/remotes/origin/parabolic_dev' into parabolic_dev
update 2d grid figure and embed
update explanations -- still lots of work to do
clear output
add additional figures and finish explanation of 2d explicit heat transfer
start fleshing out gray scott explanation
fixed some language but needs work on matrix visualization
d3 experiment
load d3 in background
try a different svg zoom library
remove reaction diffusion
add reaction diffusion as assessment notebook