Fixes Issue 110

https://github.com/moredip/Frank/issues/110
The issue says it was resolved but I was still getting the error. 

There was an issue where inf was showing up from serialized CGFloats causing symbiote to fail while parsing.

For me it was mostly popping up in apple's internal classes, UIButtonLabel, MPVolumeSlider, etc.

My initial fix was to replace inf with CGFLOAT_MAX which works, but inf as a string is a much more convenient value.