Show tags in list of charges; navigate to individual tag pages and to all tags page
Add the ability to download a CSV of charges for a tag
expand spec for charges_for_organization_export to include all fields
use new-style expectations
add spec for charges_for_tag_export
tweak expected time format in specs
expand specs for csv exports: should filter by tag, organisation as appropriate
remove unnecessary join from tag charges query
Merge pull request #19 from controlshift/tag-navigation

Tag navigation & CSV downloads