Sprite.say/think and Sprite.colorEffect

added colorEffect to Sprite
made Sprite.say, Sprite.think draw word bubbles on canvas
misc organization and typo correction
documentation changes
Stage.timer() decimal seconds, dynamic # of timers

added stage.addTimer()
documentation updates to Stage.timer stuff
fixes for facing/seesOnSides, & speedForVector
added Sprite.stamp(x,y);
recenter p.imageMode after Stage.drawTiled();
say/think scroll with character
Sprite.draw() dialog works better
adding Sprite saturation & brightness effects
various visual effects improved

Was altering source array, oops. Now duplicates costume to new PImage
and modifies that.
Sprite.touching* no longer detect hidden Sprites
revert to simple sample with pens
making new dev. branch to keep master in good shape
Merge branch 'master' into ask_example

Conflicts:
	scratching.pde
formatting
Merge branch 'master' into dev
added motion trails to stage
Revert a6d9544..2df0924

This rolls back to commit a6d9544b3798f9496e9799d8d8cb752a98042092.
visual effects looking good