Added comments about trait sets, mocked up a version in the YML
Add TraitSet model
Add trait_sets to import_template

First pass at implementation of nested trait sets
Began implementing trait_set_qualified_continuous_names

debugging recursion
Factored continuous and categorical out to common method
Refactoring in import_template.rb

Make trait_set_qualified_trait_names private
rename categorical_trait_names to categorical_trait_column_names, continuous_trait_names to continuous_trait_column_names
Added missing belongs_to :trait_sets
Support for delimited column names (to indicate trait set paths)
Initial implementation of TraitSets in import job

Not yet tested
Moved TraitSet creation by path to trait_set
Added relationships to project
Added migration for project relationships
Added ProjectsController and filters to select project
Before upload, verify project has been selected
Put project filters everyhwere.  haven't tested
Added by_project scopes
Update import_job to be project aware
Update SocialTraits.yml for trait_sets

sample trait_sets generated by make_socialtraits_template, awaiting
further definitions from dustin
Limit CSV Import templates to those in project
Finish supporting trait_sets in import_template