Alphabetize exercism.rb requires

This helps make it clear where to put new requires, and distributes new
requires in such a way that future conflicts are less likely.

All the tests pass still...

Any load-time dependency order requirements should theoretically blow up
immediately during the require. That wouldn't hold true if some class
were using metaprogramming to search for existing constants to create a
list of things matching a pattern or something, but are we doing that?

@kytrinyx, is there any reason you can think of that reordering here may
cause problems?

lib/exercism.rb

@@ -6,46 +6,46 @@
 
 require 'exercism/acl'
 require 'exercism/assumable_user'
-require 'exercism/named'
 require 'exercism/authentication'
 require 'exercism/client_version'
 require 'exercism/comment'
-require 'exercism/converts_markdown_to_html'
 require 'exercism/conversation_subscription'
+require 'exercism/converts_markdown_to_html'
+require 'exercism/daily'
 require 'exercism/daily_count'
+require 'exercism/deleted_iterations'
 require 'exercism/github'
 require 'exercism/guest'
 require 'exercism/iteration'
 require 'exercism/language'
 require 'exercism/like'
 require 'exercism/markdown'
+require 'exercism/named'
+require 'exercism/notification'
 require 'exercism/null_submission'
 require 'exercism/problem'
-require 'exercism/submission'
 require 'exercism/stats'
 require 'exercism/stream'
 require 'exercism/stream_exercise'
 require 'exercism/stream_filter_item'
-require 'exercism/notification'
+require 'exercism/submission'
+require 'exercism/tag'
 require 'exercism/team'
+require 'exercism/team_manager'
 require 'exercism/team_membership'
 require 'exercism/team_membership_invite'
 require 'exercism/team_membership_request'
 require 'exercism/team_stream'
 require 'exercism/team_stream_filters'
-require 'exercism/team_manager'
 require 'exercism/track_stream'
 require 'exercism/track_stream_filters'
 require 'exercism/use_cases'
 require 'exercism/user'
 require 'exercism/user_exercise'
 require 'exercism/user_finished_tracks'
+require 'exercism/user_lookup'
 require 'exercism/user_tracks_summary'
-require 'exercism/deleted_iterations'
 require 'exercism/view'
-require 'exercism/user_lookup'
-require 'exercism/daily'
-require 'exercism/tag'
 require 'exercism/watermark'
 
 require 'db/connection'