Move title and description to the top of the form

- Seems like the most human friendly approach to doing a form to me
- I think about the title before the kind of service, and I feel like I'm not alone here
Merge pull request #64 from alphagov/move_title_to_top

Move title and description to the top of the form
Fix updating of module descriptions

The form field had been called module_description as it clashed with an
internal wtforms method called description, which stopped the magic
method working. Instead use .data and .fields, which we already do with
module_id
Merge pull request #61 from alphagov/tidy-dashboard-editing

Dashboard editing