merge reputation

app/models/concerns/reviewable.rb

app/models/score.rb

app/models/score_user_category.rb

app/models/topic_relationship.rb

app/models/user.rb

app/models/user_category.rb

app/services/score_calculator_service.rb

app/workers/score_calculator_worker.rb

db/migrate/20160222144157_create_scores.rb

db/migrate/20160222144216_create_user_categories.rb

db/migrate/20160222144259_create_score_user_categories.rb

db/migrate/20160225101700_change_users_add_score.rb

db/seeds.rb

db/seeds/scores.rb

test/fixtures/bookmarks.yml

test/fixtures/collections.yml

test/fixtures/downloads.yml

test/fixtures/follows.yml

test/fixtures/learning_objects.yml

test/fixtures/likes.yml