removed PlanningElement, pulled up remaining methods and started fixing broken specs[skip_ci]
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
factory fixed
fixed the planning-element-factory
fixed the planning-element-status for the timelines-features
removed the has_many-relation to planning-elements in type.
removed the planning-element-related features.
renamed the planning-element-steps
removing keys with blank values from the mass-assignment

This greens our features again, but it prevents the mass-assignment of
blank values on the move.
replaced the planning-elements-step
Reverts Gemfile.lock to feature/rails3
Removes planning element generation from seeds.
Merge pull request #413 from opf/feature/rails3_remove_planning_element

Feature/rails3 remove planning element