If you attempt to use something other than a string, it will throw an error in some situations. #1318 provides more details about the error. If it is expecting a certain type, the docs should clarify that.
* add headerBackTitleStyle screen option
since the title is customizable, the back title should too.
* add documentation for `headerBackTitleStyle`
* make absence of headerBackTitle not affect return value
* merge styles so current scene can override
If there's no last scene, return the `headerBackTitleStyle` from the
current scene.
Otherwise return the `headerTitleStyle` from the last scene, and the
`headerBackTitleStyle` from the current scene, with the latter having
precedence.
* take headerBackTitleStyle from current scene
also the title style of the last scene is no longer taken into account
* Fix Modal Gestures
* Update StackNavigator.md for gesturesEnabled to include modals again
* Remove modal gesture todo
* Gesture response distance top, side => vertical, horizontal
* Initial commit
* Remove HybridExample (#985)
* Remove HybridExample
* Remove last mention of HelloHybrid
* Remove console log
* Fix flow and example
* Fix routers api docs
* Keep options in single place
* chore
* Fix styling
* Organise miscs
* Better flow type for screen options
* Flow test website and add more types to options
* navigationOptions instead of prevOptions makes more sense
* Fixes
* Fix up docs
* Fix
* Update route decl
* Provide error when removed API is used
* Remove lock
* Add validators
* Make StacksOverTabs config valid again
* Do not return
* Fix redbox
* Initial impl
* Fix up some docs and support more for drawer
* Fix comments
* Support TabBar
* Make flow more correct
* Clarify even more
* Rename all the things lol
* Also rename renderLabel to getLabel
