Refactor NodesController#copy_move_common
Simplify if statement
Fix issue when copying nodes with custom attributes
Refactor Releaf::Content::Node::InstanceMethods #move_to_node, #copy_to_node
Be more specific in rescue statement
Write many tests + minor refactoring of Node module
Merge pull request #147 from graudeejs/refactor_nodes_controller

Refactor nodes controller