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Fix lesson 2: removed extra m in Eq. (4)
Fix lesson 2—error in Euler scheme for phugoid eqs

The Delta t was in the wrong place for both equation (11) and (12).
Then these equations were repeated for no reason in the following
sub-heading.
Add linspace()->arange() challenge

and Pro tip to get the help pane
split cells to have headings in their own cell

plus add precision on convergence/consistency paragraph
Make text more precise when describing motion

especially when talking about the angles, we have pitch angle (positive
up), then glide angle in the force balance: a bit sloppy
turn around figure 3 for positive angle

and it's pitch angle, not glide angle
had to make a small change to reload fig

new figure not loading in nbviewer by simply replacing png file and
re-executing the markdown cell, yet git didn't detect a change in the
nb file?
minor change to line continuation suggestion
Merge pull request #10 from aitatanit/master

minor change to line continuation suggestion
change angle to gamma in force balance fig

there is still some confusion with angles in the text -- I updated the
figure showing forces to name the flight-path angle gamma (while
discussion above used theta for pitch angle, positive up!)
Merge remote-tracking branch 'upstream/master'