regenerate vaadin-notification with 1.0.0-beta2 (vaadin#3632)

Remove continueNavigationAction instance on proceed (vaadin#3621)

* Remove continueNavigationAction instance on proceed

Breaking change: class ContinueNavigationAction is now inner class.

Fixes vaadin#3613

* Update imports

* Correct unit tests.

* Add javadocs.

* Add unit test for postpone + proceed immidiatly.

Extract template data analyzation to the separate class (vaadin#3589)

Do not mix template analyzation logic with initialization logic to avoid using implicit contexts available in the initializer.

Fixes vaadin#3587

Update vaadin-tabs, regenerate the components. (vaadin#3559)

Do not log no theme warnings for classes with @notheme (vaadin#3515)

Check whether client-side update settings allow to have a getter (vaa…

…din#3494)

Fix logic and NPE in RouterLayout (vaadin#3309)

Don't use special mappings for Vaadin servlet (vaadin#3291)

* Don't use special mappings for Vaadin servlet

* Code review fixes.

Fix used event as BeforeNavigationEvent is deleted (vaadin#3268)

Improve the documentation on initial page settings (vaadin#3207)