fix method signature of class-side copy method of CopyModel and includes SafeAttributes
tableless AR class for specs
specs for copying attributes through CopyModel
basic specs for copying associations
use activerecord-tableless gem instead of own code for using tableless models in specs
more elegant way to specfify which stuff to copy and in what order
specs for order of copy association calls
make CopyModel#not_to_copy handle symbols as well
specs for attributes that are considered safe but should not be copied regardless

Conflicts:
	spec/lib/copy_model/copy_model_spec.rb
reload stuff gotten from map, because issues might have been moved around in the tree
some copying specs specifically for projects
fixes bug in copying timelines with non-existant options
restructure project's copy spec
Merge branch 'feature/copy_projects' into feature/select2_responsible_copy_projects