Initial page with show trait list
Updated layout of trait list
Add unique index on traits<->trait groups

Prevents duplicate many:many relationships
Remove enumerated traits in definition for Environmental
Add link to show_trait_list

Implements trait list for Trello Card #5
Implement JS control for select all traits

Not yet handled by the search_controller
Refactor assembly of trait filters into a private method

Changed trait_operator to an instance variable
Refactor assembly of lowest selected taxa into private method

Also moved creation of @results hash to early in the results method so
it is available to these private methods
Appropriately handling select_all_traits

select all traits will pull in all traits attached to the currently
selected taxonomy by group

Moved analyze_lowest_requested_taxa and initialization of
@results[:columns] ahead of assemble_trait_filters
Merge pull request #43 from NESCent/show_trait_list

Implementation of "Select All Traits" and page to show trait list