support for html5 attributes when generating engine
improve title method generation

generate title method in model only if is not yet present or when
it is translatable and we may want found first possible translation
if is not present for current locale
small form inputs styling improvement
improved page.url and frontend locale picker by choosing best available locale for page - user
we don't need use with_globalize anymore to generate list of pages
make custom_slugs available by default

+ moved in form under seo meta as it is litle bit related to that
+ updated locales
added draft_page? helper

- it can be owerrriden by Controlers that manage draftable items (f.i: Blog::PostController)
fixed missed %> !#$#@$#! to myself
use mostly already present activerecord.models.refinery/x/y i18n field in crudify flash messages
updated engine generator

- cleaned _form partial template
- improved routes for localized pages
- clean locales
fixes in form frontend locale switcher

- ensure that we generate correct url after save & redirect with frontend_locale param present
- destroy dialog when following link without save
execute update of user plugins in one transaction
added field "about" to user

It is short bio about user which can be displayed on public items related to user.
For example on blog post.
use Mime constants rather than application/json string
added extra validations to user model to prevent server (database) errors
update accordion js - making him configurable via html elm data attribute
added MAX_STRING_LENGTH constant, related to b563669210c9
added "friendly" in crud find_ method if passed id is friendly
return back page slugs in administration

- with solved friendlyId slug regeneration
- added field signature for faster lookups (especialy for nested pages)
- added field admin_path which is nested_path without / at beginning
refactoring user model - use alias_method to_s for title