Additional runtime checks and documentation updates

• Breaking change: If inputFactory returns non-collection, throw InvalidReturnValue
• Documentation updated

Huge performance improvements

Moving Collection from Iterator to Traversable allows for huge performance gains (some 4x improvement at the very least)

Transpose added

• Transpose functionality adedd

PrintDump added

• PrintDump function added, to make debugging easier. Prints debug output, but returns the original collection.

Dump added

• Dump function added, to make debugging easier.

Only/extract bug fixed

• Fixed bug: the only function always included the item with key equal to zero in the result. Caused by comparing string == 0. Also affected extract.

Replace by key functionality added

• ReplaceByKeys function added

Sum and average return float/int as needed

• Breaking change: sum function will return integer by default, float if there are float type elements
• Breaking change: average function will not force return float and will return integer if the sum/count result is integer

Some of the utility functions integrated into Collection

• The functionality of sum, average, min, max and concatenate moved into collection.
• Sum collection function added
• Average collection function added
• Min collection function added
• Max collection function added
• ToString collection function added
• Breaking change: sum utility function removed
• Breaking change: average utility function removed
• Breaking change: min utility function removed
• Breaking change: max utility function removed
• Breaking change: concatenate utility function removed

Size comparison functions added

• sizeIsExactly function added
• sizeIsGreaterThan function added
• sizeIsLessThan function added
• sizeIsBetween function added

Use these for size comparison as they don't need to traverse entire collection (if possible) to provide result.