Started on implementation for Filtering Results

Added Price, Color, Quantity filter elements to iPad sb; Moved
baseUrlString to macro BASE_URL; Replaced keywordsPlus function with
stringByReplaceOccuranceOfString;
Quantity data item added to collection cell

Copied cell from iPad over to iPhone; Removed device detection
conditional for imageView; Added storage for Qty values;
Preprocessing for filters for price and qty

Removed color filter segmentControl; Added filter functions; Modified
filter UI elements; Added info button logic tbd;