refactor to use Random.value, which achieves the same purpose.
refactor to take care of the material stuff in code rather than the editor
update the prefab and the scene for the refactored material from 2062c32
switch to Color32 to avoid some RGB headaches
First pass at getting screenshake working.  adds a PlayShake method to
the ScreenShaker script attached to the main camera in Levels 01 and
02.  See BigBaddieController to see how it's used.
document the PlayShake function
Make an attempt at Perlin Noise, but I like random from 1cf8a82 better.
Revert "Make an attempt at Perlin Noise, but I like random from 1cf8a82 better."

This reverts commit 8887424800c28fe05bd0637cddb2372fa3d8426c.
added exp popup
refactor so ExpPopup.cs handles its own text string.