Added test for Traversable.toArray.
Added test for Traversable.toIndexedSeq.
Added test for Traversable.toIterable.
Added test for Traversable.toIterator.
Added test for Traversable.toBuffer.
Added test for Traversable.toList.
Added test for Traversable.toMap.
Added test for Traversable.toSeq.
Added test for Traversable.toSet.
Added test for Traversable.toStream.
Added test for Traversable.toTraversable.
Added test for Traversable.toVector.
Reformat code.
Added test for Seq.distinct.
Added test for Iterable.sliding.