fixes #691
export addOrRemoveItem and objectForEach
Merge pull request #869 from paglias/export-utils

export addOrRemoveItem and objectForEach
add null and undefined to js reserved words, fixes #762
Merge branch '762-reserved-words' of https://github.com/paglias/knockout into paglias-871-js-reserved-words
Modify existing test to hit cases for #762.
Merge pull request #829 from paglias/691-remove-duplicate-specs

fixes #691
Merge remote-tracking branch 'upstream/master' into jquerydata