Export interests in /api/members
Export workshop speakers as CSV (with emails)
Expose favorites talk of a given member : /api/members/<memberId>/favorites
Sponsors' logo as local asset

Useful for Json API : only serve local URL
OD
Merge branch 'api-interests'
Merge branch 'api-interests'
Merge branch 'export-speaker-workshop'
Merge branch 'sponsor-logos'
Merge branch 'export-speaker-workshop'
Fixed merge regression