Linear Class

create a gasp tool
Linear(pos, pos2=None, angle=None, slope=None)

with attributes.
    self.pos1
    self.pos2 = y-intercept if None is passed
    self.angle
    self.rise
    self.run
    self.m
    self.b

and methods
    angle_between
    intersection
    find_x
    find_y
    create_parallel
    create_perpendicular