Implemented aktivitet listing redesign
Added organizer to activities listing
Added availability badges markup and styling
Minor adjustments
Add external_signup_url method to AktivietDate
Check if external signup url exists in template
Hide images from widget listing
Fix aktivitet contact info clearing
Fixed indentation
Merge branch 'aktivitet-external-signup'
Merge pull request #25 from Turistforeningen/aktivitet-list-redesign

Aktivitet list redesign
Add cancel_deadline field
Move signup_cancel_deadline value to cancel_deadline
Remove signup_cancel_deadline field
Refactor other usages of cancel_deadline field
Add spacing between operators
Group signup-methods together
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Refactor signup methods
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