Initial unit class for storing value and ratio data from user input
Tess for unit class
Removing xcode generated test
RJUnitMap class associates units to labels
unit map class now stores labels in alphabetical order and retrieves dictionary items in this order.
count method to unit map class simply returns number of items in labels set
unit tests for unit map class
Xcode project file updates
Merge pull request #2 from rob-lane/chore/unit_conversion

Chore/unit conversion