add some helpful comments and remove an unnecessary variable
rename ExpPopup to ExpPopupController because of some weird namespace
collision
first pass at a spawn animation for the PC
be a bit less opaque about deactivating the script.
Shuffled around todo list in README.org;

Added some notes about eventual plans to allow for multiple spawned
PCs;

refactor names in PCSpawner and PCSpawnAnimation to be more explicit;

Change spawning animation from a fade to a scaling effect;

make sure the PCSpawnAnimation starts out disabled;

make sure the PC prefab is instantiated in the Level02 scene