moves find_issue into v1/issues_controller - only used there
creates explicit route for work package deletion
moves some i18n from issue to work package
moves work_package_bulk controller into work_packages namespace
adds cuke for work package deletion
reimplements bulk destruction of work packages

There no longer is a destroy action on the work package controller. It needed to be either in the work package controller or the work package bulk controller. The later was the better place based on the controller's structure.
redessign of destroy form
restyles wp destroy form for extensibility
adds breadcrumb label for bulk controller
updates changelog
Merge pull request #547 from opf/fix/wp_deletion

Fix/wp deletion