add ipython notebook version of assignment
edit copyright notice
Added derivation of rocket equation
Bug in how to defined the mid-points

j_mid = (numpy.shape(T)[0]+1)/2
i_mid = (numpy.shape(T)[1]+1)/2 are not the mids point
for example if T is (5,5) then (j_mid, i_mid) = 3,3 and
should be (2,2). So the +1 shouldn't be there.
Merge pull request #107 from ncclementi/temp2

Bug in how to defined the mid-points
Merge pull request #46 from numerical-mooc/rocket

Add notebook version of rocket code assignment
Create README.md file
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Added discussion on order of convergence of C-N
change from pickle to numpy.load for compatibility across python2.x and 3.x
Merge remote-tracking branch 'refs/remotes/origin/parabolic_dev' into parabolic_dev
update data file address for assessment
Correct module summaries now that they are written.
added comparison with 1st order in time method
Add links to lessons in nbviewer
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Add links to lessons on nbviewer
Add links to lessons on nbviewer