Renamed files to lower case
Added jump
Entity looks like a space invader and moves in a parabola
Entity2d now uses the functional creation pattern.
vector2d now uses the functional creation pattern.
sprite now uses the functional creation pattern.
Broke runner into its own class
Simplified game loop
Moved runner vars off of spec
Moved entity2d vars off of spec
Moved sprite and vector2d vars off of spec
Euler integrator now uses vector adds instead of component addition.
Draws a path of lines instead of most recent line
Reoarganized runner
Deleted many unused files and updated the README