exclude final challenges from missing reviews;
changed gravatar type to monsterid;
refactoring of evaluation "others";
evaluation code refactoring;
added evaluation auto saving;
added select_challenge in evaluation;
playing around with search;
Merge branches 'comments' and 'master' of https://github.com/martflu/amanaman into comments
comment responses added to view and template
months and years added to comment model, not working yet