* feat(ios): Added support for css gradients.
* feat(android): Added support for css gradients.
* fix: Fixed gradient borders on ios
* fix(gradient): added backgroundGradient to View and Style.
* fix(ios-gradients): fixed ios gradients covering view content.
* test(gradient): Added ui app tests for background gradients.
* test(gradient): Added a test ensuring background gradient property is applied to style.
* style(gradient): Fixed tslint errors.
* fix(gradient): Removed the background-gradient property and added the gradient to background-image.
* style: fixed a consecutive blank line tslint error.
* fix(tests): fixed the bug that was causing tests to fail.
* chore(linear-gradient): fix equality comparer
* test(gradient): add linear gradients test app
* chore(tslint): update with latest tslint rules
* Introduce background shorthand style property
* Add text property in parser for BackgroundPosition value
reason: prevent parsing of background position (pass it as sample string)
* Introduce background-shorthand test page
* Modify parser unit tests to respect the new BackgroundPosition 'text' property
* Image corners were blinking in #4322 and CSS border will now draw non uniform corner radiuses if the border color is uniform
* Implement per-side corner radiuses for iOS
* Update stretch-mode example
* Update matrix-mode example
* Update image resources
* Add clipping for non uniform radii without border width, don't throw for missing image resources in css
* Init steps
* Implement logic for auto-complete for all test pages
* Init steps
* Implement logic for auto-complete for all test pages
* Expose TestPageMainViewModel
* Merge
* Improve check if example is already loaded in collection
* Reorder tests
* Fix tslint
* Include csslv
* Include new image source
Setup direct siblings apps tests
Fix direct child test
Add direct sibling test on class and type element
Add sibling combinator handling for id selectors
Completely redo sibling selector and add attributes and pseudo class selectors tests
Handle sibling via a custom group instead of a selector
Fix Selector groups creation
Add unit test for sibling selection
Fix tslint errors
