Refactor RSpec

Uses not_to style of expectation, instead of to_not. Reads better.
Merge pull request #15 from ministryofjustice/rspec-refactor

Refactor RSpec
Remove Claim#to_param

No longer needed. We don't show claim ids in the URL anymore.
Merge pull request #16 from ministryofjustice/remove-claim-to-param

Remove Claim#to_param
Added docker asset container again
SimpleForm hacks

Globally adds class to collection inputs as requested by @demwunz