Improvements to competition_galleries.

[AlbertoPdRF]

After the competition_galleries have been introduced in f87d7b8, I'm tracking here the improvements that should/can be made:

• The following need to be fixed:

  • When the validation of the photos fails, the page shouldn't crash!
  • When photos are selected to be uploaded, the :photos field should get filled with their names
  • When more than ~4 photos are uploaded (~10 MB each) the page crashes and it shouldn't

• Possible enhancements:

  • Add some popup feature to display photos when clicked on them instead of opening them on a new window
  • Change the link to a specific galery to /competition_galleries/competition_id instead of /competition_galleries/id