* The functions lume.any() and lume.all() now have a default function if
one is not provided -- their default behaviour with a single argument
now matches that of Python.
* Updated README.md to reflect changes
* Fixed typo in lume.any()'s example in README.md
* Incremented version revision number
Changed the lume.set(), lume.merge() and lume.filter() functions to take
the argument `retainkeys` instead of `isarray`, and to treat the table
as an array by default (avoiding sparse arrays) instead of treating the
table as an associative array by default (retaining keys).
