list has no method next()
make index() compatible with [].index()
coverage doctests
no coverage for __repr__
Revert "no coverage for __repr__"

We'll handle this globally.

This reverts commit 3af69aef38d90599eaeb854650f9c2c4d2a67eb5.
Merge pull request #78 from pall-valmundsson/test-attributelist

Test attributelist