[fixes #104] Adds new fields to request model.
[fixes #104] Changed field types for email and url.
[codereview] Rearrange the order for the requests form.

I also changed the max_length for phone numbers and modified the
migrations.
[codereview] Fix capitalization for contact_url field form display.
Merge pull request #116 from openrural/feature/104-add-fields

[fixes #104] Adds new fields to request model.