Open-event-server: Speakers: Implement "Export" speakers and sessions as csv for organizers

[mariobehling]

Organizers sometimes want to work on details and get a list of all emails of speakers. Please implement a button "export" speakers and sessions as csv
a) on the speakers tab
b) on the session tab
In both ares the buttons export the same document that should include all information of sessions and speakers as csv.

[LuD1161]

Will implement it tomorrow , similar to this pull request of the issue #3246

[mariobehling]

@LuD1161 I am unassigning as there is no update on this. Would be great to get this feature actually.

[niranjan94]

@mariobehling actually ... there is progress. But looks like @LuD1161 hasn't linked the PR to this properly. I have linked now.

[niranjan94]

@LuD1161 please follow the best practices at http://blog.fossasia.org/open-source-developer-guide-and-best-practices-at-fossasia/

It is very important that you do.

[LuD1161]

@mariobehling @niranjan94
Will follow best practices and make sure that it gets merged as soon as possible.
All the technical work has been done , will correct the squashing error today.