Started working on schlieren imaging example (CFD)

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+Summary of things to ask students to do:
+- Read density images (txt files) into Python
+- Compute density gradient at each pixel in the image for a bunch of images
+- Make schlieren movie out of the density gradient files
+- For density images between 1 - 10 us cut the image over the central plane of the kernel and plot Density vs. Radius. Obtain Temperature vs. Radius for a given pressure of 1 atm using equation of state.
+
+Read density data.
+Compute density gradient for each image
+Make Schlieren image for each "frame"
+
+
+
+---
+
+
+Goal: 
+Plot 
+Density vs. radius.
+Obtain Temperature vs radius (at 1 atm).
+	Use the pressure data to compute the temperature with the equation of state.
+
+
+