Update README.md
add FileSaver bower dependency
define a frontend csvExport function
add export link
example summary_export
summary functions can now directly return HttpResonse
csv export of all nodes
export edges
fix empty rows issue in export
Merge branch 'master' of github.com:jplusplus/detective.io
check permissions with topic.module instead of topic.slug in front
Merge branch 'hotfix/front-permission-check'
Merge tag 'vfront-permission-check' into develop

Fix frontend permissions