V2 files for simplified_expenses_checker

https://www.pivotaltracker.com/story/show/56226256
Fix whitespace errors
Refactor - name total variable to match docs

Clearer to follow too.
Split the bullets in simplified expenses

Remove business cost from simple total as now below the total

https://www.pivotaltracker.com/story/show/56226256
Simplified expenses checker content changes

https://www.pivotaltracker.com/story/show/56226256
Remove unmatched parenthesis from copy

Addresses pull request comment by @alext
Merge pull request #527 from alphagov/56226256-simplified-expenses-checker

56226256 Simplified expenses checker content changes (as a v2)