Removed criteria. Added minimum organizer and peer votes needed to badge.
Added 'unique' to badge: whether or not it can be awarded to a user once.
Added the start of the awarding
Awarding continues: check eligibility and see what badges one
can get from that challenge.
Moved logic to its own model.
Adding challenge adopter role.

* Button to become adopter unlocked uppon completion.
* Had to create UI similar to other elements on Arlton design because the adopter button is not on the latest mockups (please change as necessary).
* Possible TODO: The congratulations message can also say you earned the Hello World badge (those that are given automatically).
* Adopters are displayed on the helpers list (updated the css for this section badsed on Arlton's latest changes -- pending mentors section).
* Yes/No marks about adopter status are displayed on edit participants.
* Updated user profile's + dashboard section based
* TODO not related to the adopter role: check the past involvement section of the dashboard to see if it works ok with challenges.
* Refactored project users's lists (sidebar, people list, and challenges home page).
Added ability to submit for a badge via the browser. Nicer UI coming.
Merge branch 'master' of https://github.com/zuzelvp/lernanta into zuzelvp-master
Typo fix
Initial self-assessment badges award.
Made badge listing more accessible by using badge's name as the image alt attribute
Continuing on submission UI and added url to work to the submission form
Fixes for the challenges disscusion page.
Cleaned up display of the viewing of award submission
Also deleted testing badge images and added a placeholder missing badge image
Added badge image directory to gitignore
Just need submission id to view the submission
Updated media paths in gitignore so they're ignored
Added default badge image to task list page
If already an adopter, don't show "adopt" message
OBI and metrics fixes:

* A few metrics bufixes done during the past release.
* Change to allow all organizers of school of ed the access to the metrics overview page.
* Temporarily disabling integration with OBI.