Fix ConvertableTo[Rational], plus formatting.
Fix ConvertableTo[Rational], plus formatting.

Fixes #175

guersam/spire,woparry/spire,siddhartha-gadgil/spire,non/spire,adampingel/spire,rklaehn/spire,AlecZorab/spire,JackSullivan/spire,non/spire,woparry/spire,tixxit/spire,rklaehn/spire,codeaudit/spire,kevinmeredith/spire,guersam/spire,JackSullivan/spire,AlecZorab/spire,codeaudit/spire,adampingel/spire,siddhartha-gadgil/spire,tixxit/spire,kevinmeredith/spire