3.0 view

Resolves https://cakephp.lighthouseapp.com/projects/42648/tickets/2449-view-folder-name-conflicts

Basically it renames all folder names in View that could potentially conflict with user-land Controller names (and their respective folder names following convention):

- Emails => Email
- Layouts => Layout
- Elements => Element
- Scaffolds => Scaffold
- Errors => Error

I will update the migration guide and docs afterwards.