Added simple-cw-node.d.ts and tests
Merge pull request #1388 from vvakame/add-simple-cw-node

Added simple-cw-node.d.ts and tests
Fixed KnockoutComputed polymorphism

Changed KnockoutComputed to inherit KnockoutObservable to enable
polymorphic/covariant reference conversion (see included unit test for
example).
Merge pull request #1391 from butlersoftware/computed-polymorphism-fix

Fixed KnockoutComputed polymorphism
fixed typo in HighchartsChartOptions and fixed parameter in HighchartsChartObject
Merge pull request #1393 from MagicMau/highcharts-fix

fixed typo in HighchartsChartOptions and fixed parameter in HighchartsCh...