Fixed a bunch of PEP-8 issues
Modified rendering of charges form.

Added a Charges section with legend into the form
Added message when there are no charges.
Hide message when there are charges.
Group each charge in its own div
Cleaned up some PEP-8
Removed nested fieldset
Added validator for dates in future
Checks that dates are not in the future
No longer need to test against None
Fixed a bunch of PEP-8 issues
Modified rendering of charges form.

Added a Charges section with legend into the form
Added message when there are no charges.
Hide message when there are charges.
Group each charge in its own div
Cleaned up some PEP-8
Removed nested fieldset
Added validator for dates in future
Checks that dates are not in the future
No longer need to test against None
Merge branch 'mw_fix_date_and_formatting_of_form' of github.com:landregistry/casework-frontend into mw_fix_date_and_formatting_of_form

Conflicts:
	casework/models.py
	casework/validators.py
Merge pull request #62 from LandRegistry/mw_fix_date_and_formatting_of_form

Mw fix date and formatting of form