relation 7.x-1.0-rc5

Changes since 7.x-1.0-rc4:

• #1780424 by webankit, GaëlG, marcusx, Paul B, mikran: Fixed views relationships from relation base to endpoints and the other way around.
• #1345958 by kevee, Shawn DeArmond, olofjohansson, vadym.kononenko, aaronbauman, mikran: New submodule relation_feeds added.
• #2158307 by mikran: Use entity_uri() to construct paths.
• #1611752 by Uncle_Code_Monkey, mikran: Fixed entity collector to only display entities that can be added to the relation.
• #1936206 by naught101, mikran: Changed field_read_instance() calls to field_info_instance().
• #1945294: Fixed infinite arity validation when creating directional relation types.
• #1345958 by mikran, Shawn DeArmond, kevee, olofjohansson, vadym.kononenko, aaronbauman | philipz: Added Feeds integration.
• #1348808 by Jelle_S: make relation_list_types use relation_get_types.
• #1981178 by naught101: Make 'other_endpoint' formatter display as link for single items
• #1936206 by mikran: Add ctools tests and fixed endpoint field for types provided by the defaults hook.
• #1945294 by naught101, mikran: Fixed Minimum & maximum arity settings are not properly validated.
• #1977672 by naught101: stub-fix: display targets of directional relations in dummy field.
• General coder-review cleanup
• #1587608 clarify 'Directional' relations description
• #1965724 by mikran: Fixed relation_ui callback locations.
• #81431 by dpi: Fixed relation_page_title function name
• #1760026 by mikran: Fixed relation_relation_exists to count each endpoint just once.
• another coder-format error
• #1710234 by Uncle Code Monkey, steveoliver and mikran: Fixed entity collector drop-down to display bundle label instead of entity type.
• #1559354 by cdale: Added support for unary relations: arity of 1.
• coder-format errors fixed
• Several code formatting issues fixed.
• #1932164 by cdale: Delete endpoint field instance on relation type delete.
• #1924624 by RoSk0: Fixed views link visibility if relation_ui is disabled.
• #1907526 by Uhkis: Added tab for devel information.
• #1910966 by Tarch: Fixed undefined variable on admin/content/relation page.