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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Correct module summaries now that they are written.
Merge pull request #14 from numerical-mooc/master

Updating my fork version from numerical-mooc