Check that none of the variable keys have empty values
Add Travis to Xcode project
Update Travis configuration
Add sdk to Travis configuration
Fix syntax in Travis configuration
Try script approach (TRAVIS!)
Refactor tests
Rename object
Default null values to "0"
Remove safe guard
Handle empty strings
Add test for empty strings
Add podspec to Xcode project
Bump podspec version
Handle string formulas correctly
Add before_install to Travis configuration
Add link xctool
Revert back to old Travis configuration
New Travis configuration
Add README to Xcode project
Refactor isStringFormula: