LintCode-186.Max Points on a Line
[http://www.lintcode.com/en/problem/max-points-on-a-line/]
> Given n points on a 2D plane, find the maximum number of points that lie on the
same straight line.
> Example
> Given 4 points: (1,2), (3,6), (0,0), (1,3).
> The maximum number is 3.