add copyright header, where it was missing
refer to doc/COPYRIGHT.rdoc in our README
some more copyright headers for our work packages
have copyrights at the bottom of .rdoc and .md files
have copyrights in some special files
have copyright headers for .text.erb files
copyright header for .atom.builder files. we really have some funny file extensions...
have copyright headers for json.erb files
do not forget copyright header in tinymce.js and jstoolbar.js
copyright header with correct syntax in .atom.builder files
use HTML comments for the copyright header in .md files
removed PlanningElement, pulled up remaining methods and started fixing broken specs[skip_ci]
Moves code from issue.rb into work_package.rb.

This also removes double private declaration from work packages model.
removed the planning-element-features from project
removed planning-element from the specs
moved the permitted params into the workpackage_moves_controller, which is the only place it is used: This greens all moves-controller-specs
permitted params still needs a special set of permitted params for the api.
removed the planning-element from the controller-specs
fixed the planning-elements-journals-controller
fixed the planning-element-factories for the specs