Added two failing tests for select/deselect with Space button in multi-select mode:
-Idea is to let space-select ONLY toggle selection for the focused item,  also in
  multi-select mode.
Rewrite tests which used space to test for anchor location - incompatible
  with the proposed space behaviour change
Change toggleSelection to use remove/push instead of writing directly
  to <observableArray> selection, thereby leaving the selection state
  of other items in the array untouched.
This makes the new tests added in commit #cfa91d8 pass
Merge pull request #31 from mwoc/spaceselect

Changing space select to only toggle selection of focused item, but not touching other items
Merge pull request #29 from mwoc/master

Four new tests for selection update after foreach change
When foreach updated, automatically unset any selected items not
  included in the foreach anymore.
Tested in production code, but still need to write unit tests