* backgroundImage property now use Fetcher & Cache as Image component
Fix GridLayout tests on iPhone Plus - actualLength wasn’t rounded
ImageCache is closed when activity is stopped
* Fix reset of background drawable.
* additional check for drawable
* imageCache init cache on activity Started
* Fix formattedText implementation for iOS
Fix typeof undefined checks
Add slow tests message
Improve tests speed
* fix tslint
reduce transitions duration in test
* waitUntilReady will throw if timeout
fix tests that needs to wait without throwing
improve test speed
* Remove Bindable.
Fix Observable & ObservableArray tests
Fix formattedString text
Change implementation of Span, FormattedString & TextBase
properties valueChange called before native setter
* revetred formattedString tests asserts - formattedText update text property again
properties - when getting value we now use always property name instead of key (using key could return undefined for property that is set to its default value)
updated fontSize & fontInternal properties on all controls
fix font properties so that fontInternal is reset if the new font is the same as Font.default
* fix tslint errors
moved some native setters from TabView to TabViewItem.
shorthand properties converters now accounts for unsetValue.
better formatting for test duration.
