Revert "removed stargazer task temporarily for v0.4.2 release"

This reverts commit 8ae04a205112ed124b6e02fab5da565f3a50b234.
ripped out meteors (so i can put in comets instead!)
updated message to follow kpossin's instructions
partway to adding comets
fixed addComet()
added comet scores
added event logging for comets (which don't yet appear in stimuli)
fixed logging of comet events
added nifty css animation for # of comets caught
tabcat.task.logEvent() now logs coordinates of touch events
correct get coordinates of touch events
comet msg now slowly moves down, so it can't be an anchor
made some tweaks with kpossin and a TODO list
commets always start from the same Y coordinate
there are now just two comets
comets no longer cross
use CSS animation for "Catch Comets!" message
must get two right to leave practice mode
better naming
Merge branch 'stargazer' of github.com:davidmarin/tabcat

Conflicts:
	CHANGES.txt