[BUNDLE] update sinatra-assetpack with relaxed backports
fix forms and breadcrumbs
introduce deferred mechanics for elemetts

make PageTitle deferred, remove special key :page_title
make Breadcrumbs deferred
fix come elements to work with deferred ones
move #inject_placeholders to a better place
improve meta processing

remove special treatment for :meta placeholder
make Meta deferred
introduce @swift[:resource], the object to be used by Meta, it should have #meta or #title
ban spiders from login page
skip outdated test
use Set instead of Array to hold a set of deferred elements
rename overlapping class variable
pass element core filename to eval so backtrace looks nice
strip code from info for meta
don't add identity for recursive leafs
remove partial from MapTree
fix #strip_code to digest nils
drop outdated and redundant elements
mass rename of elements
mass rename of elements