Cleanr and update RichPipe docstrings.
 Two minor changes on docstrings.
Merge pull request #417 from reconditesea/klin_richPipiDoc

Clean and update RichPipe docstrings.
Add drop/dropWhile/take/takeWhile to KeyedList
Merge pull request #420 from reconditesea/klin_add_I414

Add drop/dropWhile/take/takeWhile to KeyedList