Added models and views for Comments
Updates to the comments backend
Generated Alembic revision
Added Comments url property to Idea

...and some misc changes.
Buttons on Idea page are shown only to correct user
Moved serializeObject to base template

Super() jinja blocks are cool.
Added Markdown support and json properties to Comment model
Updates to Comment API views

Added Parser, Get Comment By Id function.

@login_required in Post and Delete comment.
Added comments to the Idea page

Ideas are now ordered by created_on descending.