Don't override :session_id setting if it's being set somewhere else when
the admin starts, see: https://github.com/padrino/padrino-framework/issues/500#issuecomment-16836189
cleanup application
refactor application
refactor global configurations
clarify Tilt preamble tampering, remove split/join, cleanup
Merge pull request #1448 from padrino/cleanup-application

More code cleanup
Merge pull request #1443 from padrino/dont_override_session_id_admin_if_set

Don't step over :session_id setting on admin apps
replace Padrino::Cache::Store with Moneta