* add redent function when verifying snapshots
This allows us not to care about the correct amount of spaces and always
produces a clean output.
* make the container the parent of the wrapper element
* drop the visible prop on the Portal component
* drop visible prop on Portal component
+ Also cleanup a little bit
* expose the RenderStrategy
* implement Transition component in Vue
* expose Transition component
* add Transitions to the Dialog example
Robin Malfait