Merge tag 'vv1.4.0' into develop

v1.4.0
fix bulk upload
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
check permissions with topic.module instead of topic.slug in front
Merge branch 'hotfix/front-permission-check'