Call native setters once when a page is instantiated.
Fix background not being reset, Label's background is now set to background, not layer
Make the nativeView field instead of property for performance reasons
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