Added gravatar images to user page

And a url property to the api data.
Redirect logged in user to the explore page
Added markdown to html support

Easy as a pie.
Updates to the explore and ideas templates

Explore:

    Display 250 characters of an idea.

    Fix /u/ links

Idea:

    Better Layout
Created a profile page

On Submit handler is yet to be written.
Redirect logged in user from login to explore page
Updated navbar with a Post idea link and dropdown
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.
Added roles to User model
Changed url names for the user
Generated alembic revision for user updates

Role & URLs
Models for the voting feature