frontend checks if wallet exists
Refactor auth view code to be more hierarchical

Open existing wallet workflow done. TODO: create new & open with pin
Open existing uses the pin component

Also, adds back the ability to go back to choose screen from pin page
Remove unused templates
remove fastclick code
remove ractive.updateFastclick()
refactor create intro page
refactor read passphrase page
refactor create confirm page
clean up unused code
Fix 'create a wallet instead' link
Fix up fastclick and css references