fixed double root node for planning_elements
fixed double root nodes for projects
make rabl 0.9.3 consider #include_child_root in collections
@TODO fix rabl instead of monkey patching it
fixed double root elements in various other views
i.e. planning_element_type_colors, planning_element_types, project_associations, project_types, reported_project_statuses, reportings and statuses
fixed lock file
added changelog entry
refined rabl comments with regard to the used version
only open rabl module once instead of twice
Merge pull request #736 from opf/fix/api_duplicate_xml_root_3149

Fix/api duplicate xml root 3149