Fix adding new feeds on front-end

[olehkrupko]

• [x] Ability to test-run URL parser
• [x] Fix View button being inappropriately enabled
• [x] Add all DB fields
  • [x] title
  • [x] href
  • [x] href_user
  • [x] private
  • [x] frequency
  • [x] notes
  • [x] json
• [x] Make sure that all data fields are working properly
• [x] Make sure feeds can be added
• [x] Make sure that after feed is added you can view it