Support for different ways of expressing ratios in text (alternative divSigns)

[jsmreese]

There are a few standard ways of writing ratios that aren't parsed properly. Using a colon 3:2 Using an 'x' 3x2 others?

Ratio("3:2"); and Ratio("3x2"); should parse into a ratio just as Ratio("3/2"); does.

When parsed using an alternative divSign, that divSign should be set on the instantiated Ratio object.

When a Ratio has a divSign that is not a forward slash '/', the Ratio's divSign should be preserved through methods that create new Ratio objects (any method that uses .clone() internally).

[LarryBattle]

Ok. I'll look into this. Give me 2 weeks. :-)