Fixes jlawrence11#7 and Fixes jlawrence11#8

Thank you @puggan for the quick and easy fix to jlawrence11#8 that was implemented
here.

Fixes implied multiplication with functions

Implied multiplication within functions now work.

Added Color Options to Graph

Added static color options to Graph class.

Updated for backwords compatibility with variables

Old signis for variables didn't work, this fixes it.

Smart precision for graph creation

Smart XStep calculation added based on image size and range.

2.2 branch broke 2.1 variables, fixing

Fix backwords-compatible signis operators.

Added Graph class

Added the Graph class with many improvements over the 2.x version.
Updated README for how to use the class.

Updated Readme

Updated readme for version 3

Whoops, broke variables for a seconds

They are fixed now

Whoops, broke variables for a seconds

They are fixed now