Idea -> Thread model migration
Redirect idea url to thread if it has been migrated.
Removing migrated Ideas from index and Newest Ideas sidebar
Setting status to 'Not an IA idea' will migrate it to General Ramblings.
Add additional columns to idea -> thread migration.

%s/migrated_thread/migrated_to_thread/g
Inflated timestamps aren't populated from DateTime instances.
Force thread comment timestamps = thread timestamp on new thread creation

This will stop migrated IA ideas jumping the discussion queue.
Hide avatar for users queued for and failed moderation.
Thread model support for migrating to Idea.
Add IA migrate button to threads - no functionality implemented.
Link username to account page.
Require action token for logout action.
Merge pull request #264 from duckduckgo/user-header

User header layout changes
New route to migrate thread to IA.
Link in thread title banner to migrate the thread to IAs.
Only show IA migrate button for General Ramblings forum posts
Filter migrated threads out of thread index
Redirect to Idea if the thread has been migrated to one.
Merge pull request #263 from duckduckgo/moderation-avatars

Hide avatar
Top level idea comments have no parent_id.