stubbed out code for WritingUtensil

also declared Content object, because well… we needed to
need to return floats in float functions
drawing a rectangle

not sure why my sphere is not around…
rendering WritingUtensil

found some super helpful cylinder and cone code snippets on [processing
wiki](http://wiki.processing.org/)
added neck_height and removed neck_slope

my cone function makes more sense with neck_height.
using push and pop matrix instead scale and "unscale"
just some minor tweaks
playing with rotation
comments!!!!
implemented mouse follow and rotate as per homework for this week.
drawing on the screen. with a line. w00t
ok actually drawing to screen. forgot to save
formatting updates
Merge branch 'master' of https://github.com/wileycousins-edu/intro_to_programming