Implemented method -isMemberOfCharacterSet:
Implemented method -stringByTrimmingLeadingCharactersInSet:
Implemented property stringWithNonDigitsRemoved
Added NSString+Additions to project
Implemented method +sectionKeys
Refactored loading to also cache sections of decimal digits
Added NSString+Additions to precompiled header
Implemented method -invertedContactIDs
Implemented search for numeric characters
Some functionality of multiToken search