Added options argument for allowing ignoring properties like __ko_mapping__ and including computed values

[adamtal3]

Let the user choose which properties to include and which to ignore.

I had a performance issue with ko.mapping.toJS and replaced it with ko.wrap.toJS which lacked my most basic needs from the conversion. I updated it as little as possible to keep it fast but also allow the user to control the conversion.

Plus, I added a package.json, bower.json and updated nupkg files after bumping the version to 1.0.2.

[arj03]

Looks good, could you add some tests?

[sGambolati]

Works great on my code!