0.8.0

Breaking change: Guard properties have been renamed: validate is now canNavigate and onValidationFailed is now onNavigationFailed
Breaking change: removed abstract RouteConfig class; to create custom routing maps, inherit from RouteMap
Deprecation: StackNavigator has been renamed PageStackNavigator
Added NotFound return page type
Added ability to customise the top-level navigator with RoutemasterDelegate.builder
Added ability to use tabs with a custom page type
Fixed replace() not working with hashes on web
Fixed path URL strategy not working when it's set outside Routemaster
Fixed tabs creating a redirect loop on web
Note: Use of Guard is no longer recommended - use standard if statements and NotFound or Redirect

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