Add more mappings to feature

* Before building feature, add extra mappings and ensure tests continue
to pass
Truncate table of paths in modal when long

* When selecting many mappings users previously had to scroll a long
way to the bottom to save their changes.
* Instead hide mappings after the first 9, and show a link to reveal
all of them
Only use 11 paths in feature

* Slightly faster tests
Merge pull request #199 from alphagov/faster-save-from-modal

Don't obscure the save button when bulk editing lots of mappings