0.5

This version consists in:

• Add support for OAuth session. Old methods and classes related to cookie based sessions were deprecated and are replaced by more explicit names reflecting the kind of session we are working with,
• Add support for built-in views (such as _all_doc). Built-in views are not attached to a design document but can be queried with same arguments as user defined views,
• Several fixes, amongst other ones:
  • Fix serializing of bulk document updates #10,
  • Fix update of already existing design documents (see commit e074a4b),
• Code cleanup:
  • Avoid costly reflexive calls when using IdRev trait,
  • Use scalariform to format code,
  • Use generic types,
  • Better handling of http requests for different sessions).