Resolves#2815
* Gets or sets the number of tabs that should be retained to either side of the current tab in the view hierarchy in an idle state.
* Tabs beyond this limit will be recreated from the TabView when needed.
Less than 30 erros left, let's hope it still works
Added lib.*.d.ts from typescript, removed lib and dom stuff, added by hand XHR, alert etc. .d.ts-es for polyfills
Roll back some changes involved in separating UIEvent for dom and ios
Test combined dts-es will now use lib, while internally we will not to avoid UIEvent conflict with dom stuff
